It depends on what type of professional work you're looking at. Weddings? Don't use 35mm. For $500 you can get a good medium format starter (Fuji 645) that will improve your pictures significantly. Your Pentax gear will be perfect for the candids side.
Portraits? Even for simple senior and family shots you'll still want medium format. Roughly $800 for a Mamiya RB. PJ? For sporting events you'll probably want to at least get one of their better af bodies & lenses. But even then a change might be beneficial. (If you're good, what you have may be suitable, but get some backup equipment.) Digital isn't necessary, but might help. Pics are processed faster @ the lab and you can get them to your customers more quickly. In addition, if you do very much work at all, shooting 500 roles in one year pays for much of your DSLR body. Collin
