Comparing the Ayre KXR and the Esoteric C-03

Wondering whehter anyone has made a direct comparison between the Ayre KXR pre and the Esoteric C-03? These are both highly rated preamps and both are SS. Looking for bass and extension at the top. I'm aware that both are grate in the mid frequencies.
Hmmm, as you know I have only heard these 2 units in separate systems. . . my preference remains on the musicality of C-03. G.