Yes, they are thinner, more comfortable for the average ear, and sound great out of the box with super extension both on bass and treble. I might revise my opinion on the TO600, but for now, the TO400s would be my recommendation for the "best" mmcx toneking, fit, cable, and sound wise.
Mind you my recommendation is not necessarily what I personally enjoy the most, but what I think would suit most people the best.
I have a personal sweet spot for the TO200, but it doesn't have great bass extension, but for jazz I don't care