The entry-level cameras from all the different manufacturers all fall into the category of "very good", IMO. The thing that makes the K-50 unique is its weather sealing. It also has a very large grip and should be more comfortable to hold, and it has a very capable sensor for still images, though its video mode isn't on par with what Canon offers.
If you want average image quality, the 18-55mm will certainly get the job done. You can opt for a better lens such as the Pentax/Sigma 17-70mm, or the Pentax 18-135mm, if your budget allows it.
This comparative review should give you an idea of what to expect. The K-30 and K-50 are virtually identical, except for their external design.
Canon T4i vs Nikon D5100 vs Pentax K-30 Review - Introduction | PentaxForums.com Reviews Adam
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