Yea this here is what had my head spinning back when I was going to first upgrade to a decent camera from the old bridge camera I'd been using for years, as I wasn't sure which would be the better route to go as I wanted to focus more on macro photography. In the end I opted for the full frame as I would then have the option to crop of course, it's this though thats had many other people who are new to photography confused also when trying to compare what they are shooting against others with the same lens but different body type. Still trying to decide atm between the R6 and the R6 and trying to find more info from others actually using both cameras for macro
I mainly shoot Macro Photography and have been using the RP for a while now, I decided to upgrade recently and bought the R6 since I really couldn't justify to myself spending the extra $1,400 for the R5. Well that is until I actually got the R6 and started using it, as after about 2 weeks I decided to return the R6 and spend the extra $$$ for the R5. I liked the R6 in all honesty except for the image quality when shooting in crop mode, I do not often shoot in crop mode just every once in a while depending on the subject I'm photographing. That said I just got the R5 in tonight and so far am loving it, also the image quality in crop mode is so much better at high magnification in comparison to the R6, not to mention the image quality in full frame is by far leaps and bounds ahead. Now I can't wait until the new / used EF Tamron Teleconverter I just found for $79 bucks (Paid $69 for the first one used in excellent condition) can't wait to be able to double the teleconverters up for my canon 100mm f/2.8L is usm macro lens.
Any chance on a off topic subject that you can suggest / recommend a low weight long range lens ??? I tried the Sigma 150mm - 600mm Contemporary my friend has and that thing is a tank at approx 6lbs, I need to find something at 400mm or potentially higher that is also in the 3lb weight range. I'm disabled so need something I can manage easier in comparison to that Sigma, which did a number on my shoulder just using it briefly
One great thing I figure with the R5 (and R6 by that measure) having IBIS is that it opens up so many lens I avoided before as they didn't have image stabilization