Thanks for the replies.
I bit the bullet and bought the stack. Using the DT 1990 Pro, I can definitely tell a difference between the two. Most noticeably, the bass is much tighter and the highs are less grainy.
For example in BFV, the bass from explosions would almost sound distorted and I started to worry if it was my cans. Using this stack, everything sounds so much tighter and cleaner across the board. No bass roll off in to the mids either.
I've signed up for a free month with Tidal and the difference is even bigger when listening to masters and lossless tracks.
What filter are you using on the E30?