For context, I own the Fiio FH3, Truthear Zero, Simgot EW200 and now this. All the above had slightly offensive upper mids. While I actually like that to an extent, it sometimes got too much that I had to reduce the volume whenever I listened at high volumes. The EM6L while warm at lower volumes, it starts getting brighter at higher volumes, but mind you it's just the right amount of it imo. And it's less offensive than the rest.
While the Fiio FH3 has a much better build and a better punch to it, the EM6L has better technicalities. The Soundstage between the two are similar when connected with a 4.4mm output, the EM6L has better layering and depth perception that it helps if you are gaming.
I primarily game, and am a casual music listener, and in that aspect, I'd rate these above all the other IEMs I mentioned. But the Fiio FH3s come close, and may not be a bad option with its better build and punch. If you're into Hip Hop, the FH3s would be better, but the EM6L is a better all rounder.