I'm looking to take my macro photography to the next level. As far as bodies go, I have a 6D and a 70D. For the 6D, I have an EF 100mm f/2.8 L macro lens, and for the 70D I have an EF-S 60mm f/2.8. I'm looking at the MP-E 65mm f/2.8, and here's my...