I think the Fuji colors ave more "punch" at default settings, but that's not to say you can't tweak a Pentax to get the same or similar results, but in doing so I have found it often has some negative consequences.
On my X10-X20 you are offered 4 different film simulations, as well as the ability to tweak the colors to suit your taste. The default colors are usually my preference. Just my personal experience...Fuji does better reds than my K5, but I have learned to get the reds right in the K5 with a lot of experimentation....so a lot of what we see depends on our ability to make adjustments and can't be blamed or credited to the camera or brand.
On my color correct monitor, this is as close as it comes to being the true color of this Cardinal. It took me a lot of work to learn to get the right red out of my K5, but it is possible.
Whatever a person likes, that suits me! Some like it "punchy" some like it more bland.........and some like both depending on the subject!
Regards!