Seeing as Bryan's already got the 12233 crops up, I thought we should start a thread on which one would be better.
For a start, in the bottom crop, the Zeiss is a bit darker (1-stop more vignetting), but the L has a lot more CA (look at the square).
The mid-frame on the Zeiss looks sharper, the '14' is a lot better than the L.
In the centre, the zeiss looks a bit rotated compared to the L, and there's a dead pixel on the '3' of the '36'. I'm not sure this is a property of the Zeiss lens or not. Maybe Bryan's been using his test camera too much and really really needs that 1DX upgrade.
At any rate, the L looks like it wins in the centre, more definition of the black/white boundaries in the circles.

Can't tell shich one looks more distorted, almost even.

But man, with that lens cap on, even mounted on the 1Ds3, it looks worse than my Zodiak 30mm Medium-Format fisheye...