KA1 has a bigger screen, which is nice if that's what you're after. It's also waterproof without having to worry about the flap. For those to whom it matters, it has the flush bezel. The H20 you already have is better in every other way.
Lighting on the H20, although only of a single colour tone, should be perfectly even. The supposedly improved resolution of the A1 is not apparent, (unlike the bygone Glo HD which was immediately noticeably sharper.). The touch screen on the H20 is much more responsive and accurate than the A1. The optional SD card makes the memory as large as you want it, and the battery life more than twice as long.
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