Absolutely hands down on the G2 paint. Here are a couple calipers painted with the G2 from another forum, both are on Jaguar STRs.

Oh, next time I wash my vehicle I will post pics of the glossy black calipers. I keep forgetting.







----------

Incidentally here is a picture of my wifes S Type. I have painted the calipers with non-heat silver paint and the same gloss black again non-heat that I had laying around the garage. I have to repaint the silver twice a year, only because it turns a bit greyish.