I believe the Oppo 203 also does Dolby Vision. Mine certainly thinks it can, it has menu options for it and lists it as the HDR type if you press and hold 'i' on the remote to pull up the audio/video details. It then screws up by playing 24p discs to my non Dolby Vision TV (ie Dolby Vision in the player) by stupidly converting them to 60p for output, but I blame Dolby for that not Oppo. I just avoid Dolby Vision 4K discs now, I'd rather play 1920x1080 blu rays at 24p.
MQA can be done in the processor, no need for support in the player. And anyway, even for people that think it's a good thing is it worth investing in MQA now to the degree that it influences equipment purchasing decisions? It's a dead format.