The cats-eye bokeh screams tilt/swing to me, but it's also possible that he's just shot wide-open on a lens that vignettes a little and then cropped the image, which will bias the direction of the cats eyes. There's a post above stating the lenses used and they have no movements.

I think there's also some careful choice of colour balance in his scanning - in many of the shots I see nasty green shadows, which probably goes with the pastel nature of the highlights and the way he's overexposed by what looks like a couple of stops.