This is a well-specified lens that ought to be worth the £400. There is a minor reservation in that the review lens sometimes parked itself at the minimum focusing distance in AF mode and would only move again if you switched off the camera and then reactivated it. This apparent fault may have been caused by careless previous handling (the review sample having arrived unboxed) so our scores for Quality and Performance assume that this is not a design problem. Potential buyers should check their intended purchases for this behaviour before parting with any cash.