With a Canon EF lens, the T2i costs about $840. The iPhone 4? $199.
This is a bit of a stupid comparison that puppyfightclub is making.
I mean, ok... let's put some perspective on this if you REALLY want to compare oranges with, well, Apples (nyuk nyuk)...
The Panavision Genesis HD blows away every single DSLR on the market. It has a full-frame (equal to Super 35mm) 12.4 megapixel CCD sensor (5760x2160).
The iPhone 4 and Canon T2i both shoot in pathetically-compressed H.264, with 4:2:0 chroma subsampling, whereas the Genesis HD shoots in full-bandwidth 4:4:4:4 HDCAM.
The iPhone 4 in particular uses 1.5 Mbps bandwidth, whereas the Genesis HD uses the Sony SRW1 Digital VTR with a Dual Link SDI at 880 Mbps (about 4.5 megabytes per frame).
The Genesis HD premiered at the NAB conference and ASC Cinematographers could not tell it apart from Super 35mm, with identical colorimetry and sensitometry. Because it was built from the ground up to be a cinema camera with a single RGB CCD, it doesn't require digital lenses that get prism-split for the RGB sensors which introduce chromatic aberrations. Therefore, it can mount all standard Panavision prime and zoom lenses to achieve identical Depth Of Field characteristics at every theoretical F-stop value.
Therefore, the Panavision Genesis HD wins.
Oh, and by the way, Panavision does not sell their cameras... but you can rent the body (lenses extra) for $4000 per day.