No the Kindle 4's page turn buttons are at the side, the same as the Nook & Odyssey (see the images in this review
showing the Kindle 4 in comparison to the Kindle 3/Kindle Keyboard).
In terms of the Kindle Touch v Sony PRS-T2 if you aren't going to bother with page turn buttons, there's probably not a great
deal to choose between them. As a slightly newer device the T2 might be a little faster, but then if you're going to consider the Kindle you'd be as well looking at the Paperwhite, as a slightly faster more responsive option than the Kindle Touch, unless the light is of no interest (and of course, quality control isn't as good so you might not get a great screen first time round).