pentax 16-45mm lens

Hi i'm thinking of purchasing a pentax 16-45mm its to replace a tamron 17-35mm which i used as my landscape lens.But i also purchased a sigma 10-20mm which is a fantastic lens for my landscapes.I would like to know if its a good lens or are there better out there before i purchase thanks for any comments.

The pentax 16-45mm is a terrific lens that is currently on offer at a terrific price.

And there is one on this very forum that has just been reduced to £125.
if I didn't already have the lens I would snatch his hand off.
https://www.pentaxuser.com/forum/topic/Pentax-Gear--for-Sale-Moving-on--8240/p-1

so would i

The Pentax is a good lens but it's going to give you very limited additional focal range over the 10-20, depending which zoom you have (if any) maybe a 17-70 lens is a better option ?

simon