Olympus Zuiko Auto-T 135mm f2.8

     Wow!   This is a great lens.    In typical Olympus fashion it is a pleasure to shoot with.  Handling on the 6D is effortless.   

     Sharp!  Sharp from f2.8 up and from corner to corner.   This lens is sharp with absolutely no visible falloff in the corners of any kind. 

     Image rendition is excellent.   Bokeh is very natural and quite smooth wide open.    Colors are spot on.   Contrast is excellent and very consistent.   Shadow detail is crisp.   
     The only negative I could find is a bit of fringing at f2.8 in extreme lighting.   Really, it's very minor.   
     The possibilities with this lens seem endless to me.   Cityscapes, landscapes, portraits, studio, macro (just add a few extension tubes),  Grayscales images look quite nice thanks to the beautiful contrast of this lens.
     See the comparison pic below which was teaken with a Canon 100mm f2.8 USM Macro.    

Olympus Zuiko Auto-T 135mm f2.8.jpg

6D

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f4

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f2.8

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Canon 100mm f2.8 USM - f4.5 - 100% crop

Comparison of quality to Zuiko 135mm

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f2.8 - 100% crop - extreme corner

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f2.8

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f4 - b/w

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f2.8 - tight crop

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f2.8 - 100% crop

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f2.8 - 100% crop

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f4

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f4

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f2.8 - tight crop - b/w

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f2.8 - 100% crop - b/w

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f4 - b/w

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f4