Well there are other factors besides internet speed that go into how fast a page loads.
Things like the processor and memory come to mind. I don't know exactly how powerful the K2 processor is but my guess is that it's not nearly as powerful as an iphone.
The way i think of it is that the iPhone was built to handle apps, phone, browsing (multiple windows), and more apps. The K2 was built to read simple text files. It doesn't need such a strong processor. Also, stronger processors drain more battery. So it doesn't make sense to put an A4 processor in an e-reader.
All in all, sorry to not answer your question but, I think your concern has more to do with other pieces of hardware as opposed to the 3g connection.
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