Both cameras are great, and probably overkill for your need, lol. That's coming from another hobbyist with an R5, which I absolutely love. AF is slightly better on the R6II, R5 has more megapixels. Without editing, R6II tolerates high ISO a bit better, and most of the other differences are just down to ergonomics. Oh, and the R5 has a faster memory card slot, which means more expensive storage but faster transfer speeds. All in all, the R6II isn't lacking in anything you require, which is why I'd recommend it to you. It has two advantages (AF and low light), which I'm sure will come in handy. Both are fantastic cameras, but the R6II is also newer and cheaper.
Hey there fellow Canon Head! A fellow Canon Fan/Nerd and an "overly enthusiastic" Family Photographer with CGAS (Camera Gear Acquisition Syndrome) here, to the pointy family says "That's enough photos!" :) A few weeks ago, I've been in the same place you are now, deciding between the mighty R5 vs R6 Mark II. In the end, even I was surprised with my decision, but after a lot of research, real world trials and use before pulling the trigger, I finally bought..... The Canon R6 ! (Not the Mark II, but Mark I). Here's my reasoning: Yes, Canon R6 Mark II AF is quite better than Canon R5 in very specific scenarios, like really fast turning subjects where eye focus has to shift from face focus really fast for example. For 99.9% of family photography use-cases, this really won't matter, and Canon R5's AF is EXTREMELY GOOD. Eye focus is spot on! Basically performs at the same level as R6 MII. So unless you are thinking of shooting fast moving wildlife, or ice skating or ballet dancing with lots of quick turns, AF isn't a practical difference to choose between R6 MII and R5. If you are okay with this compromise, R6 shares the same AF the R5 has! So AF wise, you are good to go with R6 as well :) Low Light - All sensors being full-frame, works with same area. So the higher the pixel count, smaller per-pixel area = less light per pixel = higher noise at higher ISO. Although R5 does quite well to keep noise at bay, R6 MII outperforms it in low-light. And the R6 does slightly better yet! (I've tested all 3 in control environments) Issue with MP count: This one was my biggest internal debate. I wanted the sharpest images possible, so, naturally, I wanted the highest MP count possible (For this, I even briefly considered buying the Sony A7RV and switching to Sony too :) ) But in practice, what I found was, this didn't make much if a difference between R5 (45MP) vs R6 (20.1MP). Reason being the lenses I used. I use a Sigma EF F1.2 ART 35mm & 105mm. These lenses can at max decipher about 30MP worth of detail (Refer to DXOMark tests). Which means although you are capturing 45M of dots in R5, it's details isn't at that level. Therefore, unless you are purchasing some top tier RF lenses to pair with the camera body aswell, R5 wouldn't practically yield much more detail than the R6/R6 MII. Whatever difference that will result, wont be recognisable unless you pixel peep in controlled environments doing side-by-side comparisons. Basically, it's not a difference in sharpness that you'll miss not having. (This is coming from an absolute Pixel-Peeper!) Which brings us to files they produce. Compared to R6, the R5 produces quite a bit larger files, meaning you'll have to either invest more in storage, or take fewer photos :) Also, if you are working on Adobe Stack (Lightroom/Photoshop), unless you already have really good PC/Mac setups, you'll face some noticeable lags/performance issues when editing files produced by R5 comparatively. Additionally, the in-camera storage. If you want to have a shutter buffer similar (or better) than an R6 with the R5, you'll need to shell out a bit more on more expensive CFExpress cards compared to SDs. So when I considered all of this, given I only mainly do Photography (I don't do video that much if ever), It made far more sense for me to get the R6 over the R5 and save the difference to invest in more gear. Now between the R6 MII vs R6, the 4MP difference isn't really noticeable even under pixel peeps unless you try to match 100% and look at the scale side by side. Sharpness is pretty much the same. Given my local shops had MASSIVE discounts for R6 over R6 MII, I went with this, and the huge difference in budget that suddenly became available to me by going from a R5 to a heavily discounted R6, allowed ms to stay in budget and invest in multiple off camera flashes, remotes, softboxes etc. Honestly, today, I wholeheartedly believe I made the best decision in going this way. Regardless of what camera body you get, as long as they have about 20+MP, Full Frame and good AF, you won't notice much of a practical difference compared to you investing the difference in some good lights, and controlling your scene/light etc. Maybe use the difference in budget you get to invest in some good lighting and explore that world. You'll have soo much fin learning a lot of new things, coming out of just on camera flash or natural light shooting etc. and also invest in some good lenses and expand your lens kit. This too can make quite a big impact in your photos. :) After having already shot a lot of photos with the R6 with the new set of gear I bought for the price difference, I can honestly say, I'm happy with the decision. It hasn't missed a single AF shot so far, hitting eye everytime, even in really low light. Photos are amazing, everyone loves the upgrade, and non of them (my family/friends) even have any idea of R5/R6/R6 MII etc. Now if you can't find a camera deal for R6 brand new or if the difference between R6 vs R6 Mark II isn't over $300-or so, might as well go for the new R6 Mark II. In my case, I had about $600 of a difference, which made my decision a lot easier between the two. :) ** Side Note: The only thing I kind of wish the R6 had is the top screen. But besides this, honestly, R6 is a beast. If you are going to often do videography too, then it's a different discussion though. :) let me know if you need my thoughts on this, as I ran comparisons on all three on this too. Not typing it here as it'll be similarly long :) Ahh, it's been long, but hope this helps! Cheers! ๐ฅ