My (Opinion) is No don't waste your monies on another expensive player.
I had the UB820 then exchanged it for the current UB9000 and it performs just fine with my JVC RS4500 Laser Projector IMO.
I think sometimes we all should maybe enjoy what we have and not constantly looking for some Ultra-Small-Improvement that is hardly noticeable.
Thanks, so that whatever I choose I can not lose. In terms of price / performance looks for me win for UB820 if PQ is similar to others with HDR optimilizer OFF.