This lens has now been with me for close to 6 months and it continues to impress me. DXOMark published this test, which confirms what I have seen. It also gives measures vignetting much closer to what I have seen, compared to Lenstip who found it to be rather bad in this department.

http://www.dxomark.com/index.php/Pub...lens-for-DSLRs

For those of you who wants a very high performing lens at a reasonable price. This is it.

/Eldar