Here is a full review of the Pentax X90:
http://www.steves-digicams.com/camera-reviews/pentax/optio-x90/pentax-x90-review.html
There are sample photos at the end of the review.
I find it difficult to see any difference in picture quality between the three cameras you mentioned. All are excellent.
..
Hi there,
Would anybody be able to tell me anything about the Pentax x90? Is it better that the Panasonic Lumix FZ100 or the Panasonic Lumix FZ40K? Is it any good in low light? What is the picture quality?
Thanks!
jpld

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