I guess it really depends on what systems you're using as to how a comparison between the ICX814 and KAF16803 really is. From a quick and dirty calculation, on the same telescope and FL the 16803 should be ~8x quicker to reach read noise limited at Ha than the 814; this is using a QE of 40% and 53% respectively.
I can go through the numbers when I am not at work
This basically means that a MLx814 on a 10" F/4 would be read noise limited at the same time as a 10" F/6.8 with PL-16803. That is effectively a 10" RC with 0.85FR. In real world terms. Pixel scale of 0.76" & 1.1" respectively.