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On top of my low light high ISO tests I also tested my Sankor Anamorphic 2x lens.  One thing I really learned is that anamorphics need to be focused at a specific distance to get the desired effect.  Of course I only realize this after I do this, so I'll try and do another test later.  Focus is very difficult, next time I'll bring an external monitor.  The 100mm Macro surprisingly was the most difficult to focus.  I think it has a much shallower depth of field than either of the FD 1.2L lenses.   http://youtu.be/U5Oh-IBFZyY   http://youtu.be/eL0HesvFrPc   http://youtu.be/zEk-7OEkVAU   http://youtu.be/ZaRwD_L0n-g   Out of all these tests it's clear that there are limitations with both cameras.  Here are some notes:   - EX TELE mode is much improved on the GH3.  There is more detail and less noise, although it is still very noisy.  Not sure I can call it "grain" but if you really need to use it you can.  But I would still go with a prime over EX TELE mode, even if it is a great lens like the Leica 25mm.  GH2 clearly is bad in EX TELE mode, worse in very low light - Detail is excellent for both cameras.  I still think the GH2 has more but only by a little.  Again focusing is critical. - GH3 clearly has more dynamic range and retains more details especially in the shadows.  The last video you can see more tiles in the shadows at the left of the image. - GH3 can shoot more flat and retain more color detail too.  The last video I upped the saturation to 150% to match the GH2.  You can't go far at all with the GH2, it is so baked into the codec. - GH3 is 2/3 of a stop brighter at high ISOs.  However the codec isn't great for low light.  I think the 50Mbits IPB is better than the 72Mbits All-I for low light.  Just the noise grain is better and easier to remove.  In bright conditions they are about the same.   I prefer the GH3 over the GH2 for usability and for the image.  I'll still use my GH2s because they are still very stellar cameras.  But I think there are many improvements in the GH3 that overall make it a better camera.