I'm pretty sure OP means 1 3 tomoe sharingan in the other eye and not rinnegan.
Casual bijuu slicers, bijuu chakra suppressors, can't be hurt, 20 minutes of izanagi, casually tanks rasengans anyway, touches you once and you're dead, yeah.
if its MS + sharingan instead of MS and rinnegan then itd be a more close battle than this time but obito should still have the advantage to last 5 minutes.