I think those of you who think the W4 are "veiled" sounding should try an experiment - use the W4 and only the W4 for a week or two, with the best tips that you have for getting the sound closest to how you like it. Then after that week try your other IEM, and note your first thoughts that come to mind as you hear them with ears and brain that are tuned in for the W4.
I'm one of those that after doing that finds the CK10 or SW-Xcape to sound painfully bright, and my Monster Turbine Pro Gold to sound dark and muddy in comparison, while the UM3X and TF10Pro sound doesn't change much at all with the long brain burn-in from using the W4. I'm also using the Westone UM-56 tips as my favorites, but in silicone since I lost my vinyl set. Still, it seems to me that the W4 sound best when one is not hopping from one IEM to another frequently, especially between ones with different sound signatures. Listen to a bright IEM like CK10 for a while and anything after that will sound veiled or dark. I used to find my Stax O2 to sound dark and bassy, because I was switching often from brighter phones like HD800, HE-5 or Grado RS-1, but when the O2 are the first ones I put on my head for the day I can't hear any darkness or lack of treble in them at all (same with the LCD-2 which remind me of the W4 in a full size can).
When I went on spring break for a week (returned only 2 weeks ago) I only took my W4 and ES5 with me, and I used the W4 more because the ES5 were too isolating and it drove my family nuts when I didn't respond to their yelling at me. I was still a very happy camper. The W4 are not as detailed, vivid and sparkly as the ES5, and in a direct comparison you might want to say that the W4 are "veiled", but really they're just more laid back but still very detailed.