Nope, Paffett wasn't/isn't F1 stuff. DTM/F1 doesn't easily cross over it seems. Paffett did some testing with McLaren and was much slower than Hamilton for example.
I am surprised how much there is really - most of the DTM drivers have raced in junior open-wheel cars and obviously di Resta has gone one way (with Susie Wolff soon to follow?) while David Coulthard and Ralf Schumacher (with Jenson Button to follow?) have gone the other way.
More drivers seem to come to DTM via open-wheel series than other tin-top series.