Originally posted by Des
Interesting to hear your experiences.
What I take from this is that although you were happy with the quality of the images you got from the Pentax, you wanted something more compact and with better AF. I infer that neither the Fuji nor the Nikon gave you both of those things. While you got your Nikon DSLR and lenses cheaply, and are happy with the AF performance, you are finding the system hard to adjust to, and are not satisfied with the IQ. The Fuji's AF wasn't any better than Pentax and their lenses are expensive. Their 18-135, for example, costs about double its Pentax counterpart.
Maybe this is a reminder of the virtues of the Pentax system, including good ergonomic design, user-friendly controls, value for money in both cameras and new lenses, a great range of legacy lenses, rich colours and generally excellent image quality (not to mention WR and IBIS). The shortcoming which has taken you to a Nikon DSLR (and you are not alone in this) is AF performance. And as Steve points out, Pentax is catching up in this area, and should not be judged on a 2009 model camera.
Pretty much yes, but i will clarify that the Fuji AF was at least accurate which is more than I can say for Pentax where i had constant FF and BF issues from the K200 to the K10 to the K7. Actually with the K7 if was not FF and BF it was the camera/lens combo selecting targets well outside the AF point I had selected. It was like a three year old attracted to shiny things. Biggest issue with the Fuji is the only affordable lens for portraits was the 60mm but it's a macro.
The Pentax ergonomics are great, agreed 100%. I don't really know what it is but it may be the shoddy WB on the Nikon that means I am always faffing about whereas with Pentax auto WB worked so well that i'd not need to switch shooting modes too often. My default mode is to shoot in A and adjust ISO until I hit the shutter speed I can tolerate, not easy on the Nikon.
To address the messages re. modern Pentax cameras, whilst cost effective the screw drive Pentax lenses and SDM are a long way off of Nikon's mechanical refinement. Not build quality but refinement.
One last thing, FUJI absolutely nails caucasian skin tones, just nails it. Fuji's rendering in general is very, very pleasing, quite similar to Pentax with the previously mentioned wonderful greens and blues but Fuji has the slightly better skin tones. Nikon has NFI what they are doing with colour, miles behind.