Finally got my ES5 back yesterday. Gotta love Swedish customs, my parcel spent a total of 3 minutes there (living in a small country has it's advantages) and it was dropped off at my doorstep 2 hours after arriving in the country. The 5 day shipping actually took 4 days, weekend included, which was a nice surprise.
This set seems more accurately shaped to my ears which also makes it harder to insert. Getting them right is a bit of a process at this point, while the first pair just went in and couldn't be adjusted at all. The tips are much longer, and I can eat a hamburger without breaking seal which is kinda neat - no problem hitting those high notes. Oh and they look great, huge improvement over my first pair, although some imperfections still exist, like little nicks in the vinyl. I have one problem though, that the left ear-piece doesn't entirely seal my outer ear. I can feel air moving just atop the ear-piece, and while it doesn't affect sound or even isolation much, it will take some getting used to.
As far as sound there's quite a big change from the first set, if memory serves me right. They're not as bassy, there's less reverberation especially in the low end of the spectrum, they have more "air" and the treble has stepped up a notch. I think there are two things at play here, 1: the longer tips make sure the sound tubes are not obstructed inside my ear canals, and 2: the tighter fit makes for less resonance, which also affects things like footfall - it's very muted with music turned off and completely indistinguishable with music turned on.