K-50 is the same as K-30, only with a different design. I tried the K-30 and it was probably the best entry-level DSLR at the time: it has a very good viewfinder, great ergonomics with 2 command dials, splash-protected body and its image quality is very similar to flagship Pentax cameras.
In other words, I believe Pentax K-50 is an excellent camera.