USC?I have a USC compact in .45, and a P239 in .40. The USC is much thicker and handles like a full size pistol. The P239 feels more compact, is slimmer more like a 1911, and in the waistband disappears.
A better comparison might be between the P2000SK and the P239. I carry them both, like them both. The P2000SK is still thicker and to me feels better work outside the waistband or in an ankle holster, while that P239 cries out for IWB carry for it's relative thinness.