Now we see through a glass, darkly...
- Apr 5, 2016
They are quite in different leagues to my sense.
I'd say save even (much) more and take R5. You will have decent reach (nearly 20Mp APS-C with good pixels) and at least, everything R6 can do as well.
As said JustUs7 though, + some complements :
- if reach, and light weight/smaller body+APS-C kit lenses is the priority, take R7 (18-150 looks like a great walk around kit zoom and there's a risk you won't have as full usage of it with R6 as with R7)
- if FF is the priority (beauty of colours, more bokeh, more light, higher ISOs etc..), then take the R6
This 32Mp sensor is very good and will give you decent colours, DR and precision all the way for landscape to my sense.
I attached a basic panoramic view made with M6 mark II and 11-22 (let's hope they'll do a similar lens for R).
I'd say you probably can't go wrong with the specs of R7 if image quality is the question anyway, then, but I still think the priority may be to do serious handling test to ensure you'll be at ease with the shape of this camera.
On the other hand, both an R6 and an R7 can be had for about the same price as a single R5.
The R7 looks to be a much better camera for sports/action where reach is an issue than the R6. By the time you crop the R5 to R7 size (because your lens is reach limited), you'd probably get slightly better image quality with the R5 but slightly better AF performance with the R7 (if it's true that it matches the R3 in Servo AF performance). For me, I'd rather have a slightly noisier image that's in focus than a slightly cleaner image that is slightly out of focus. YMMV.
The R6 will be a much better camera than the R7 for landscapes and flowers. It's also about as good as the R5 for those use cases unless you plan on printing/displaying very large.
You do get the best of both with the R5, but it's only one body so you'd be limited to a single lens at any given moment with no backup if you have an issue with your one camera.
Sometimes two bodies come in very handy for sports and action, especially if one is APS-C and the other is FF. Throw a telephoto on the APS-C body and a wide angle on the FF body and you can cover a lot of ground with only two lenses. Start the play with your "reach" body/lens combo and if the play comes straight towards you on the sideline swap to the "wide" body/lens combo to finish out the play. With a two camera harness it's very fast to go from using one body to the other without missing shots changing lenses.
(The image numbers are reversed because the clocks on both cameras were not perfectly synchronized and the latter shot has a slightly earlier timestamp and was automatically sorted ahead of the earlier shot before the files from all cameras were renumbered in sequence.)
Or to catch the play with the "long" setup and then get an immediate sideline reaction with the "wide" combo.