For low light: MFT with f1.4 or Full Frame with f2.8?

Started Jun 16, 2014 | Questions thread
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For low light: MFT with f1.4 or Full Frame with f2.8?
Jun 16, 2014

I have to choose which camera system I will buy into.  I will shoot many club dance photos, meaning low light. Also on my "want" list is compact size, sharp portraits, 50fps video, autofocus under 200 milliseconds, and silent operation.

Basically I am choosing between

- Panasonic Lumix GX7 (Micro Four Thirds) where I can afford lensus such as the f1.7 20mm and maybe even the Noctricron f1.2 42.5mm - but I am a bit worried about buying into Micro Four Thirds at this time.

- The Sony a7(r?) where I can only afford optics with half the light gathering ability, e.g. f3.4, but has a very immature lens selection right now, but which might offer me a lot more options for upgrading in the future.

As part of making up my mind, I am wondering whether a f.3.4 lens on the a7 Full Frame sensor will give me the same low light performance as an f1.7 lens on the GX7 MFT sensor.

Any advice?

Panasonic Lumix DMC-GX7 Sony Alpha 7
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