Offhand, I'd say both screens feel pretty solid. The iLiad seems thinner and bigger, hence the comparison to a comic book. The stylus is not really useful, and the response of pen to screen is pretty poor - you can't even set up the stylus to your writing style. I'm not a big Wacom fan anyway.
The Sony feels more substantial. The screen does seem slippery (the "glossy" description applies here) where the iLiad is a little more textured. Maybe that's the touchscreen component you referred to...
I am pretty nitpicky visually, and I still think that both screens look fairly even. Part of the problem in comparing is that Sony allows me to resize the fonts and I can't do it on the iLiad. So the text on the iLiad is tiny and on the Sony I can make it large, medium or small. The iLiad might have that function, but it doesn't work on my Gutenberg collection of Sherlock Holmes and Agatha Christie books.
If I had it to do over again, I would surely get the Sony and spare myself the expense and hassle of the iLiad - which comes off as an interesting prototype, but not ready for prime-time.
