You didn't really think we'd let you get through a day without setting the iPhone 4 down next to the iPhone 3GS, did you?
The verdict? Well obviously we prefer the iPhone 4, but we will say that the lack of a curved back has us flipping the device around quite a bit post-pocket-pull. But the iPhone 4 is thinner, feels nicer to our hands, and... well there are a lot of "ands," the last of which is ...and you'll have to wait for our full review for our full opinion.
Ok, we'll let one thing out now: while you may have pooh-poohed the Retina display from what you've seen before, when it comes to viewing text there's just plain nothing else like it out there. We've included a detail shot of the Retina Display up against the iPhone 3GS's display after the break (along with the rest of the gallery) and we're pretty sure it'll put most arguments to rest. Yes, it's not necessary to read web pages or ebooks, but seeing electronic text at this level of refinement changes you, deep down, and suddenly all other electronic text looks like amateur-hour.