In macro, often need to open F11 (on APS-C) to achieve much of the object within the depth of field. In full frame, need to use F16 or more closed to achieve the same depth of field, and this negates (in part) the advantage of full frame at high ISO. Moreover, DUAL PIXEL AF, combined with the 70D articulated LCD is great for macro.Mind showing your math?My favourite photography genre is macro and I do a lot of it! Shooting with a MR-14 EX and extension tubes, I absolutely love the IQ of my subjects but equally hate the noise and banding in the shadow areas.In this case, the EOS 70D is the obvious choice. Plus a new one will cost you less than a secondhand EOS 5D2.
With the same composition and framing... yes... but at identical distances (and I'm not sure why this is) the depth of field for full frame is greater. It's all very confusing.