Owned the KPA 4 pcs. The sound stage is one of the widest and deepest. My only complaint is it sounds like Krell, while the alternatives imposed lesser of their character into the music.
But nothing comes close to KPA's dynamics and ultra wide/deep presentation. It seems to have a way to 'squeeze' out the last ounce of juice of the music.
Compared to the later phono stage, such as Tom Evans and Linn Linto, the Krell is a bit on the slow side, but still very fast relative to ARC PH3 (btw, I would take KPA over PH3 anyday). But, KPA and Krell linestage (such as KBL, KRC) would be a perfect match, because the Krell linestage is on the fast side, so they probably compliment each other.