The 800s are definitely good enough to hear improvements in source equipment. Sennheisers also like high amperage and overcome some of the complaints about them. The Schit doesn’t have that. Now a lot of people will come say the opposite that there is no difference.

I’d suggest finding a friend or dealer with better equipment so that you could listen for yourself rather than asking on the internet where half the people answering have never heard the 800s and have no experience with something as good as you have let alone better.