I was considering the MT8s as an upgrade to my DT770s which broke down recently, (no, repairing it is not an option in case someone intends that suggestion) but the reports are very conflicting. Please, do not try the sales pitch on the MT5s, it's disgusting. Anyone who has the DT770 and the MT8, could you tell me whether the soundstage on the 770s is much superior to the MT8s, and the details also?
DT770 are undoubtedly V shaped - and can sound like there's a quiet 'hole' in the centre - almost like the weird 'anti-pressure' effect of noise-cancelling headphones - an odd hush in the centre frequencies, the MT8's much flatter - vocals more detailed and forward - though can at times be too forward (this is often the case with closed-backs that don't employ a V shape freq signature).
Bass on the DT770 is greater, though the MT8's are not repressed in the bass, but are more natural. Sub on the MT'8 is impressive - when there's sub in the source.
Highs are more metallic on the DT770 and can get painful and irritating, highs on MT8's are nearly as pronounced but more natural - not metallic.
Soundstage is greater on the DT770's, partly as the drivers are further from your ears and their V-shape freq signature, though the soundstage of the MT8's is not totally lacking, again it's more natural - everything spread without huge drama - more connected than torn apart.
Yes and I am the guy who recommended the MT5's a few years ago! - I still like the MT5's for long use, general listening, but for shorter sessions when I want to hear more definition I find them too dark now, so the MT8's have finally won me over. They are now my go to. Oh and BTW I just wrote the above switching between my DT770's (80ohm) and the MT8's.
In the end there's nothng like the DT770's (even my DT1990 pro are not like them), so if you want something very close to the DT770's, you'll need another set of the DT770's (the 80ohm BTW are better then the 32ohm, the 80ohm less piercing treble and generally a more solid sound than the 32ohm). If you are up for stepping sideways slightly, the MT8's are very worthy, yes soundstage is slightly less, though details better and certainly less fatiguing than the DT770's.
I do think you might find the MT8's too flat coming from the DT770's, they are not really 'listening pleasure' headphones, they're designed as 'studio monitor headphones'. You might need to continue your research.
I'm also interested to hear what others here have to say about these two headphones.