All systems have their pros and cons. Pentax has weather sealed bodies with anti-shake. They also have zero affordable weather-sealed primes - nor does anyone for that matter, so it's a wash. Pentax and Nikon both have kept support for legacy lenses, with Pentax making every one image stabilized. Advantage Pentax. Pentax AF lags behind everyone. Advantage... well, anyone but Pentax.
You can buy a CF card adapter that fits a SD card inside it. That way you can even use an Eye-fi card with the old Nikon.