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I think either K3 or KTouch will be better than K4 for web browsing, if you need to do much typing. However, K4 is faster, so that may be helpful for browsing. I'm hopeful that KTouch will be significantly better since you should be able to navigate links, pan/zoom more easily. If it weren't significantly better, they would not have crippled 3G functionality (restricts web browsing to wikipedia).
But as others note, web browsing is still rather painful on a Kindle. Still, I would not be without it for wikipedia access alone, and you can even use it to borrow library books without needing a computer, or to visit the Manage Your Kindle page on amazon.com.
K4 and K3 are mostly the same for PDF, the only difference is that K4 has a faster CPU. But then, it has less storage, so it's more limited in how many you can load on.
I'm hopeful that on KTouch PDF will be somewhat better for PDF, since it will be easier to pan around a page, and again KTouch has a faster CPU. But I doubt they've enhanced PDF functionality beyond that, for example to support PDF reflow or PDF bookmarks/TOC.
Images are supported in a few ways: you can convert them to .azw (using Amazon conversion service), package them into .pdf (using 3rd party tools), or use the undocumented picture viewer (still there in K4, unknown status for KTouch). On Kindle, .azw images can only be zoomed to fit the viewing area (a little less than 800x600), while PDF and the picture viewer allow pan/zoom. Again, this is not what Kindle was designed to do.
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