His main points:
- [he doesn't like] Live View. If you try composing your image in bright sunlight, it's nearly impossible to see.
- [these cameras let you] make use of the mouthwatering, supersharp, add-on accessory lenses that camera makers promote to let us zoom in really close or go wide for wonderful vistas.
- Auto focusing is very problematic, more so on the D90 than the 5D [on the D90 it's manual focus only once recording]. [...] On the 5D, Canon adds a cool button on the back of the camera to keep the image in autofocus.
- Advances in low-light sensors have gotten so good, you could shoot a movie practically in the dark with the new 5D
- ...videos are likely to be less steady than on a video camera, your zooming rocky and the images shakier. [.. His] advice: Use a tripod for your SLR videos.
The Nikon D90 is available now, the Canon 5D MkII sometime in November (though the way the economy is melting, maybe it'll never get here...)