I find the A4 to be very comfortable and I haven't heard other complain about comfort either. Something like the ASG-1PLUS is considerably more bulky. If you're looking for multiple driver IEM's including dynamic drivers it's limited how small the can be.
PM4 vs A4 size comparison:
The A4's slightly larger but fit better in my ears due to longer stem, ymmw.
You can also check out my A4 review in here for other size comparisons.
Edit: check out the second post in this thread for link to pictures of me wearing them.
Welcome to Head-fi and sorry for your wallet
A lot of those you like it compared with is really new (as is the A4) so might take a while before you see any comparisons. Fwiw the A4 to me is on a different (higher) level compared to the PM4, no doubt in my mind about that. Haven't heard any of the others yet unfortunately.