I compared the K3 and the Sony 350 side by side and they appear to have the same contrast.
Some people say that the K3's background color is a little lighter than the Sony 350/650, but I couldn't see that difference myself. I am colorblind so it's difficult for me to see the difference between grays.
I didn't like the K3 font at all...it's a strange equal-thickness font that I personally find hard to read. As with all things, YMMV.
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