Where the Q10 camera is small and relatively affordable, insofar as products sold for several hundred dollars can be called such, the K-5 II & K-5 IIs don't even try to pass themselves off as anything of the sort.
Priced well beyond the $1,000 / 1000 Euro mark, even not counting the lenses, they are overall better at everything.
That includes image quality, zooming, autofocus and, most importantly, withstanding less than stellar conditions.
Both cameras are reasonably resistant to cold, dust and bad weather, and what is particularly interesting is the DR II (Dust Removal II) mechanism, which induces ultrasonic vibration to shake dust off the CMOS sensor.
Like the Pentax Q10, the K-5 II and K-5 IIs DSLR cameras will ship starting October 2012. Go here
to read all the information on them.