Originally posted by dylansalt well from what I have seen, it's a crap lens
The kit at 18 is better as is the 16 end of the 16-45.
I assume you are referring to this sample only? Because quite clearly looking at the general range of images as well as objective tests, neither statement is close to true. the 15 *blows away* the 18 end of the 18-55 in every possible way, and it also beats the 16 end of the 16-45 quite handily in almost all respects - the 16-45 wins only in corner sharpness wide open, and considering it isn't as wide as the 15, that might not be a real win in practice. In all others respects - center sharpness, corners stopped down, distortion, CA, flare resistance, etc - the 15 wins.
I would agree that now that we see the right crops, it does look like decentering on this copy, although I also agree that it would be prudent to do a more controlled test to verify this.
Quote: For the price of that one lens I reckon it's better to have the zoom 16-50 2.8
Well, a 16-50/28 is far more versatile, of course. But you pay for that - it's a big big heavy zoom that don't go as wide, it costs significantly more, and it isn't quite as good optically (very similar in overall sharpness results, but with significantly more distortion and CA). There's really not much comparison between the two overall; they serve different needs.