RP body ('ish) but R6 Mk ii internals at £1000 less.
No IBIS a pain as is the battery which is half the size of the R6 ii.
Weight and size superb for a full frame camera and ideal as an entry level to full frame or, if like me, you already own a full frame camera but want a lighter smaller body.
IQ stunning (as exactly like the R6 ii)
Handling great but bigger L lenses feel OTT on the smaller R8 body. For example whilst the RF 24-105 f4 L feels great, the RF 24-70 f2.8 L feels way too heavy IMO.
Very easy to customise like all Canon bodies.
One SD slot may put some people off but if not shooting professionally is it really a deal breaker ? This isn't really intended for that kind of buyer.
I also have an R5 and am loving the form factor of the R8 which is just great. It is far easier to use and though I am conscious of the lack of IBIS I am not seeing results that show it as an issue. I am noticing the lower battery power though and I don't take video ... so if you take a lot of video beware the small body comes at a cost of a small battery.
I love the R8 and would thoroughly recommend it.