Is it clear what was shot with what?
I'd probably guess that the Phase file was on the right, since you see the Hasselblad mirror slap in the ambient area on his nose, and his face was, I assume, strobed.
But who knows. Very hard to tell, at all, or worse, when rezzed down, (or worse, when the metadata has been stripped out!)
What input profiles did you use on each camera, inside of CaptureOne? That alone will make a massive difference in color rendition. The Input Profile is as important, if not moreso, than the brand and type of camera. The first thing you look for is the red around the eyes and the red in the lips.
The left file feels like Canon color too, and feels like the slight wompiness of the 85, when you stick it right in somebody's face, tight. The right frame feels like the flatter-feeling 100.
I'll be the first to stick my neck out, and risk being wrong. Hell, he probably shot them both with a Canon Rebel, and processed them differently...