Donked by a 2+2er

[Wynton]

This hand requires thought because you say the sb is a very good player.

Given that, the only hands I can put sb on include a King (with either a straight or flush draw). Without accounting for metagame or table image considerations, I think a fold is best. But if you're determined to see what sb has, then I believe you should be raising, to eliminate the weak player who could easily be drawing.