Comparing the two cameras, the Canon 700D (T5i) is an upgrade but its debatable whether it's a upgrade worth making. The cameras are, from what I can see, fairly equal in quality within their respective brands. If you want to make a serious upgrade you need to look at full frame (35mm sensor) Canon DSLR's. These are ones such as the 6D or 5D. Possibly the 7D but don't quote me on that one.
It is however down to your personal research and judgement. The selection of lenses you'd get with the 700D is far superior to the Sony camera you use. Again, it's whether these points make it worth it for you.
Best of luck!
James.