It depends on what you shoot and what you feel you are missing. I have been pretty happy with Pentax and feel that the glass is the reason that I stay. If you have good glass and decent skills, you should be able to capture nice images, regardless of the brand you use.
Personally, most of my images are either landscapes (mostly pixel shifted) or snaps of my kids. My wife does shoot weddings with a mixture of K-1 II and K-3 III cameras and has felt that they are adequate to the task.
Just a few examples.
Pentax DFA 24-70mm
FA 31 limited
DFA *70-200mm
DFA *50mm
DFA *85mm
DA 15 limited
DFA 100 macro
As others have said, if you can say why you are dissatisfied with Pentax and whether waiting 9 or 10 months till (hopefully) a K-1 III is announced is something you could deal with.