The true equivalence of the OM-D+75mm vs Canon 5DIII

The price of the new 75mm f1.8 is about the same as the Canon 135mm f2L.

I was considering getting one or the other since I own both systems so I decided to work out the equivalency, since so many people seem to obsess on this word.

OM-D + 75mm f1.8 = 729 grams, which is equivalent to 1,700 grams in Full Frame format (5D3 +135mm f2L). Unless you're a one trick pony who shoots everything as shallow as possible, this is what it really comes down to.

This also illustrates one of the reasons why I haven't touched my 5D2 since picking up the OM-D on it's release day here in Japan 2 months ago. And also why I'm seriously questioning if I need to hold on to the Canon, or at the very least keep it and one lens only (I'm thinking maybe the 50mm f1.2 or 85mm f1.2 would be nice).

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Canon 5D Mark II, 24-105mm L, 70-200mm f/4L IS, EF, 100mm f2, Tokina 16-28mm f2.8.
Olympus O-MD E-M5, E-PL3, 12-50mm, 14-42mm II, 17mm, 45mm f1.8.
Ricoh GR-D
Sony DSC-V3 (used for IR)