I'm exploring FF at the moment because I remember really loving the shallow DOF effects, smooth color gradation and workable files. I did try the EM5, but I couldn't come to grips with it. I will likely pick up an EPL5 once it's out. At any rate, in my exploration, I've been considering some of the Canon L lenses for my 5D. I currently have a 35/2, 85/1.8 and a telephoto zoom. I usually shoot 50mm, but I thought I'd stretch myself with a 35, and if I liked the 35/2, maybe try a 35/1.4, but alas, I'm not sure it's really for me. So, I started thinking about the 135/2. For similar DOF, that would be somewhat like a 67.5/1.0 on micro43. Of course, there is the excellent 75/1.8, so I thought to myself, do I really need 135/2 on FF, for what I want to achieve in portraiture? I'm beginning to think no. I really like to have some context even in portrait work. With the 135/2, there is almost TOO much background separation. Consider these pictures, which are excellent in many ways, but to me start to feel like the are in front of backdrops, rather than on location: https://farm9.staticflickr.com/8055/8083887722_9f3ea736b0_b.jpg https://farm9.staticflickr.com/8183/8085492420_09390ed2d8_c.jpg https://farm9.staticflickr.com/8195/8077285854_5f9681a9a2_b.jpg Though sometimes that can work, like this one: http://www.foton-foto.com/Portfolio/PortfolioOmahaPhotography/i-QnHHDLV/4/XL/IMG3388-XL.jpg But, if you were to stop down the 135L to around 3.5 (which would be a similar effect to the 75/1.8 ) you would get something more like this: Canon Digital Photography Forums btw -- all these photos I got the links from POTN (photography-on-the.net) where a number of excellent photographers post their use of Canon technology from their work. To me, POTN is like mu-43 but for Canon. Let me be clear: I LIKE ALL THESE PICTURES, but they are not the style I think I want. When I look through the 75/1.8 thread here on mu-43, I see a lot of work with certainly enough DOF to get good 3D effect or separate, but without too much. Such as: https://farm9.staticflickr.com/8473/8084539783_b28f7eaff0_b.jpg http://www.3dluvr.com/grid/photo/SMKUppsalaOffroad2012_10/SMKuppsalaOffroad_44F__.jpg https://farm9.staticflickr.com/8458/8052260837_1d0160cb90_b.jpg http://www.3dluvr.com/grid/photo/Fo...2012/FormulaOffroadNorgeMatrand2012_51L__.jpg So, instead of the $700+ (used) 135/2, the 75/1.8 at $800 (new) might be just the ticket. Another side benefit I'm finding in general is that the m43 lenses tend to be very sharp right out of the gate, whereas if you want sharpness the FF and even APS-C lenses need to be stopped down. Lastly, the reason I was exploring the 35/1.4 was for shots like these: https://farm9.staticflickr.com/8043/8086112239_6cbb07d2fd_b.jpg https://farm9.staticflickr.com/8179/8070516982_8e37a8854b_z.jpg https://farm9.staticflickr.com/8309/8071226652_06cbd2f792_b.jpg It will be very interesting to see what the upcoming Oly fast 17 will look like. I've been testing my full frame 35 at 2.0 and 3.5 to compare, and 1.8 on m43 will be very nice indeed.