yes it is.. that fact is evident from the fact that they have quoted the widest non-fisheye zoom lens to be sigma 15-30mm... Now we have Canon 10-22mm and Sigma 12-24mm...
The things which attracted me were that it was one of the few articles which listed the widest and longest focal length lenses... Specially I am attracted by the Pentax 17-28mm f/3.5-4.5 full circle fisheye zoom .. never heard of something like that..
Anyone in singapore using this lens