The Pentax DA 12-24mm has an average review score of 82%

Score (%):
Pentax DA 12-24mm f/4 AL ED [IF] - Review
Similar to the Tokina variant the Pentax SMC DA 12-24mm f/4 AL ED [IF] is great ultra-wide zoom lens although it isn't free of flaws. The sweet spot of the lens is at the wide end of the zoom range where the center quality is outstanding and the borders and even the extreme corners reach very good levels and that's already straight from f/4.
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Pentax SMC DA 12-24mm f/4 ED AL (IF) lens review
Pentax's lens has a reassuringly solid feel. The IF label might suggest that there will be no movement of the focusing ring when AF mode is selected but that is not the case. That disappointment and minor cosmetic considerations aside, this is a very nice lens indeed.
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