And I didn't buy my camera to keep up with anybody. Nikon and Canon make fine cameras but if your reason for switching is to be taken seriously by the "pros"...
... then show them what you can do with what you have. ;-)
If you can do it. I shoot professionally, and there are a number of things in the lens line I miss quite badly: a 400mm top end zoom, for one, like the Tokina 80-400 series 2.
Last Saturday, I missed the ability for really quick focusing while shooting an AMA motorcycle road race.
My K20D is superb for most uses, but Pentax blows its owners off in the long lens field, not even helping with someone else's lenses for use. In fact, they interfere with Tokina at two ends of the lens spectrum, the 11-16mm and the 80-400mm. Yup, they've got star 200mm and 300mm teles, but there's no long zoom at all.
Please don't mention the Pentax 100-300mm, as that is a royal piece of dung.