It might have been said, but I'll say...
Image quality at base iso 100, you won't see the small difference (at least I didn't see it, you may have better eyes than me) between the older models and newer models (e.g. 500d to 70d)
Product shoot, you will be thinking light, strobes, reflectors, lamps all sorts of other lighting equipment rather than the gear itself. For many shoots I've seen, they will be using iso100. Lens will depends on the size of the product you shoot.
Video, the af improvement in the 70d will not likely be useful if you are really shooting a production video where most people will be using manual focusing and those rail stuffs. If you are using auto focusing for the video, your video will likely hunt quite abit at irregular speed. E.g. tracking focus, subject moves, the af will hunt forward/backward very swiftly, but it's not smooth and consistent.
So if you are going to shoot some videos, I'll say the most important thing is to be able to control the settings of the video (aperture, shutter, iso, fps, file output type) where entry body is usually lacking. (If none of the video stuffs is impt, I think the phone can do pretty well...)