Da* 55mm F1.4 is about the level of the Canon 50mm F1.2 offering better build, better wr and a slightly longer FL while tracing behind in speed (slightly smaller aperture an slower Af).
The 300\4 from the other makers are in their pro segment and the DA is one of the better ones.
Da* 200\2.8 would be in the pro segment at Canikon too.
Fa 31/1.8 is of pro quality although a bit slow to make it smaller.
The Da* 60-250 could arguably count as pro as it actually provide more to the table than the standard pro segment 70-200/4 others stock. The fact that it's not a complete ff lens may bump it down.
The whole 645 segment is pro.
To say that Pentax got no Pro quality lenses compared to what other makers stocks as pro is plain wrong.
---------- Post added 07-28-14 at 12:49 PM ----------
Originally posted by dfujevec Pro grade system consist from body (let say K3), pro grade lenses, advanced flash system, other accessories and pro grade customer servis. All should work as one. And Pentax is not. At this moment is hard to pronounce one Pentax lense that is really pro grade lens.
The most lacking lens areas are wide and fast lenses, long lenses with huge apertures and speedy sports zooms.
Though nothing in the lens segment is as lacking as the flash system, tethering and pro services.