Hello all photography lovers out here!

My name is Guadalupe and Iíve been thinking about buying a Pentax K3 in order to upgrade my Sony Alpha 33. I have a Sigma 50mm f/1.4 but Iíve read that sigma can change the mounting in order to fit Pentax so that wouldnít be a problem.
Iíve been saving quite a lot of time for a more advanced camera and I was wondering if betting for the Pentax K3 would be great or if there is any other camera inside the same Price range which would offer better characteristics.
Thank you so much for your patience.