Everyone should note I make constant technical mistakes so please take anything I say with skepticism.
I compared C1 vs 90a with Retroarch, the latest Spider-man movie at 4k HDR, Doom Eternal, and Elden Ring. The C1 has a “sparkle” to the image because of the contrast of the deep blacks. The colors are richer as well.
Doom Eternal was interesting on the C1. You can’t do 120hz, BFI and VRR. I generally preferred the 120hz VRR over the 120hz BFI on Doom.
I didn’t/don’t expect Megatron to preform well on the WOLED panel but I’ll do a non-scientific comparison and take pictures. I’m evaluating this TV as my daily driver monitor so one display will have to be sold or returned. 90a is still a great display with my criticisms and the best LCD I’ve used.
Both these TV’s have a ton of options that don’t work together which means you have to experiment around a lot.