RP is 1k and the R8 is 1500, but seems like a noticable step up
R6 vs R6ii, the ii only really seems to upgrade video and a have bit smoother OS along with better battery life. The autofocus system tracks a better variety of subjects, but seems negligible for the most part. The R6's video is limited to 30 mins before you get an overheat warning.
rp is a great camera
although not full frame r7 is a beast