I have seen 5N having yellowish tint especially on skin tone. One of the strong point of Oly is delivering great looking OOC jpeg especially if you are shooting portraits.it seems like gx1 has this yellowish issue, i think one of our clubsnap member mention too.
You can always adjust these things PP but for peeps that just want to point, shoot and post / share on web, the ooc jpeg quality is more than good enough for most situation.
It pretty much comes down to what individual like as each has their strengths and weaknesses so its best to explore the camera's strength and work harder to compensate for its weaknesses.