I had the ck10 a few years ago. I think the im02 is very close, with better performing highs and low end.
The im02 is not quite as bright, and the bass is not as recessed.
Still the im02 has the same feeling of air, detail, and impressive ability to catch the highs naturally, cymbals sound like true cymbals. Sound is very natural and not artificial.
Compared with the im03, that one is darker, but not quite a dark earphone.
I find both to be neutral, but slightly different flavors of neutral.
Hope this helps.
Edited by Carlsan - 3/30/14 at 7:28am