Lee Westwood is an exceptional ball striker and a contender in almost every major championship.
The interesting part about Lee's swing, which I regard as somewhat unique, is his impact position. Is that a chicken wing? Surely that cannot be good? Remember that the only factor that matters is the physics (forces and angles) that the golf club imparts on the ball.
Retief Goosen is the another premier golfer who gets into this impact position, although to a much lesser degree. In looking at the top picture notice that the handle of the club is positioned in line with the lead thigh. This is the key element. With the driver, the shaft should be vertical or leaning slightly forward, as in the Westwood image, but with irons there should be a few degrees of shaft lean. As a result the hands should once again be aligned with the lead thigh.
The moral of the story - get the club in a great position, relative to the ball, at impact and good things will happen - chicken wing and all.
Should your chicken wing not be quite as functional as the two players above here is a little help: