krell KCT vs krell EVO 202 both preamp

Hi, i'm in the market for upgrading and i'm interesting in purchasing the krell EVO 202 preamp in the use market. I have never heard them side by side so any suggestion or advise will help, How is the sound (clean, transparent, image, staging, dynamic) between them? Is it worth it to upgrade from the kct to the evo 202?

Thanks
mac

current system.

KRELL KCT(PREAMP)
KRELL FPB 450MCX (AMP)
ESOTERIC X-01 LIMITED (SACD-CD PLAYER)
TRANSPARENT REFERENCE XL CABLING AND CAST.