Out of the box, they sound good, but I feel that the tone of the treble is too high; should be a little darker. I also wish they had more bass. Time to burn them in and then change tips. My guess is that I would have preferred the Carbo Basso.
The CKN70 even with the Philips SHE3590 tips are still too trebly for me; tone doesn't sound right. I'll probably be selling these.
Right now, my favorite is still the S500.
Give them some burn-in mate, I thought pretty much the same as you when I listened to them out of the box.
Also try some double flange tips, does wonders for the whole spectrum.
Plus you shouldn't be really comparing S500 and IEMs. Its not the same.