Everyone is different
GD, but a zoom is a most handy thing. Smaller is also handy. For my personal needs, there is nothing the X100s can do that the X20 can't, and plenty it can do the X100s can't.
I see great shots here with the X10/20 and X100/X-Pro, so it's mostly what you think you need, what you print, if you print, and what you will use and use often and with enthusiasm.
I printed this one 8x10 and it was gorgeous( Epson Matte) .......I suspect the X20 can do even better, and that's all I need!
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I love my K5, but the X10 has been my "go to" camera for the last year and a half. Like I said, we're all different, but I am very excited about the X20.....silver and black, just what I wanted too!
Regards!