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Kit lenses will also not be great performers in terms of star image quality in corners...
The best result on wide angle lenses I have was with already mentioned Canon FD 50mm f1.4 (I found it on ebay last year). It is really good..
Very sharp (in centre but some coma in corners, depends on F) is Tair-11A (135mm)
I also have 200mm Tamron and 200mm Sun (Pentax?), they both are so-so (Tamron is slightly better I think in terms of CA, and it has much better coating, so lower internal reflections), however consistent over the whole frame though.
Yes, star - test should be done before buying.. not always possible, not every supplier will be happy to accept back the number of lenses until you pick the perfect one (if such exists at all)
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