Has their 70-200 been released? If so - then if I had been in a Pentaxist's boat, I would be pretty well set with the three new f/2.8 zooms. Actually when shooting Canon, I'm mostly content with just two lenses, a 16-35 and the stabilized 70-200/2.8 (the latter is sometimes replaced with the Tamron 70-300). Even the longer option is there - the 150-450 (again, no idea if it's already on the shelves or not). Now if I had been using primes, I would've been in a bind... but some areas are covered by Sigma already, and even a few native ones exist.
Let's recap what is missing from a zoom shooter's point of view... maybe they need a slower/longer UWA zoom with front filter threads (similar to the 16-35/4 that all the other major brands have in their arsenal), and a slower/lighter telephoto zoom (a 70-200/4 or 70-300/4-5.6 type). Prime-wise, they just have to start from scratch.
Let's recap what is missing from a zoom shooter's point of view... maybe they need a slower/longer UWA zoom with front filter threads (similar to the 16-35/4 that all the other major brands have in their arsenal), and a slower/lighter telephoto zoom (a 70-200/4 or 70-300/4-5.6 type). Prime-wise, they just have to start from scratch.