I've had UE11s for the past 8 years and I finally made the jump to JH16. They are worth every penny. The bass is light years ahead of UE11s and just so much more full-bodied and multi-layered - like biting into a hearty piece of finely aged steak! The bass never indecorously encroaches upon the decadent mids and highs, which are just delicious. Absolutely the best IEM on the market today for the price and for the casual listening. The fit is spot on and the acrylic feels so much more stout and denser than whatever material my UE11s were made out of. These IEMs are simply a triumph and the soundstage from them are just MEGA! I am rediscovering all my favorite songs, immersing myself in them, what an IEM!
 
Update: to think that these IEMs couldn't get any better, I ended up getting a TWag V3 balanced cable and an RSA protector. WHAT A DIFFERENCE! The bass has more impact, the mids sound even more lush, and the highs sound even crisper. There is DEFINITELY more instrument separation on top of it and a very noticeable increase in soundstage.