I don't care for the new front end but I don't think it's bad either... the 2021 IS refresh is probably one of the best sedan designs on the market, so unfortunately any edits to it were going to be downhill. Lexus' design language continues to get closer and closer to Toyota which I don't like, and the L E X U S script on the back looks tacked on, which it literally is (ok, not that big of a deal).
The interior is a major upgrade - I really like it. If Lexus had released this interior with the 2021 exterior, they would have been able to call it a new generation and running that car from 2021 - 2027 would have been great. The steering wheel is parts bin NX/RX/TX whereas the old steering wheel was unique to the IS/RC but hard to nitpick when it's so hard to justify this car's existence at all.
No V8 = no care for me. I'm just glad this car exists still, but it's not for me personally.