Whether a lens “works” on a camera typically means if the image the lens projects is large enough to cover the sensor. As long as the lenses you want to use project a large enough image you should be fine (you can look up Canon’s website and it’ll typically tell you if the lens is capable of filling APS-C, APC-H, or full-frame). If the lens cannot cover the sensor you’ll get a black vignette around the edges of your image (because the image circle from the lens is not covering the sensor). You’ll also need to make sure that your lens will mount and be controllable by your new body. Canon makes several different lens mounts for it’s lens. The most common is EF. But there are EF-S and EF-M lenses as well. Just double check your lenses with whatever camera you want to move into.
For $1K you have a lot of options at your disposal. If you want a full frame Canon DSLR you can look at the Canon 6D. If you just want a Canon DSLR regardless of sensor size you can find some good deals on a 70D, 7D or 7D Mark II. Or just step up to a newer version within the line you’re already familiar with – t5i or the upcoming t6i. If you want to switch brands you can look at the Panasonic GH4 or the Sony a7s (which you’ll need adapters to mount your EF-mount Canon lenses to).
Keep in mind that NAB is next month and most every company will showcase their upcoming equipment there. So if you don’t need another camera tomorrow, you may just wait and see if anything else gets released that hits your price points.
Ryan Holmes
http://www.ryanholmes.me
@CutColorPost