Fuji X100/s X1.4 Teleconverter

What would be the difference between a pentax k 50 and a fuji xt1 with an extra grip. The size? The price? The quality? Or am I daft as usual. Don't get me wrong folks, I'm seriously interested to look into the matter. SO if anyone has an opinion to share, I would appreciate it. Of course I can find it out myself on the net. Are there by chance any pentax owners here in the first place?
 
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