Try SCRATCH Play:
http://www.assimilateinc.com/products/scratch-play/
It reads DNxHD/HR MXF and also Quicktime encoded with DNxHD/HR, plus has some rudimentary CDL/LUT grading options,
scopes, plenty of raw formats, support for VR, Oculus and a bunch of other stuff.
And it's free of charge - when starting it up, just switch the licensing tab to "free player" and enter your email, that's it.
Cheers,
Mazze