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OM-D E-M5 Mark II.
Only $100 more than the 70D, and OH so much more camera. 5 stop in body IS, huge array of native primes that are razor sharp even in the corners wide open.
18-135mm STM? I had one. Not good. Not good at all. You need to be at f/8-f/11 at all times to get a decently sharp image. And the zoom droop, wow. You can't point the lens down or up at all without the zoom sagging. Forget that lens. For your own good.
Even the first gen E-M5 is a better body than the 70D, and it is well past two years old. And if you want a larger grip, or even more features, look at the E-M1.
Any of the OM-D bodies I mentioned has equal ISO performance to the 70D, but the files can actually be pushed without banding appearing. They also all have more dynamic range than the 70D. Not to mention that the M4/3 lens selection blow EF-S out of the water. How many primes does EF-S have? Not many. How many f/1.4 or faster primes does EF-S have? No first party ones.
Want to go even farther? Get an OM-D and put the Sigma 18-35 f/1.8 zoom on it with a speedbooster. Instant f/1.2 zoom lens.
