[Klaus]

The small Panasonic set up is about 1/3rd of slower than above mentioned APS-C mirrorless from Canon and Sony, not that big a deal when shallow DOF was not something to look at to begin with.


If you want to make a real equivalent set (not really the purpose of this thread?), skip that Pentax and insert a Canon or Nikon 70-200mm f4 on APS-C. I'd like to show the Nikkor in the comparison, but the site does not offer that lens:
http://j.mp/2pBalVz

 

It's not totally fair though. The 70-200mm f/4 is a FF with a bigger image circle than necessary for APS-C. An APS-S format 70-200mm f/4 could be smaller.

 

The thing is - if you bring everything in sync there's barely any size difference (other than due to special designs like fresnel elements or whatever). That being said - there is nothing like e.g. the Leica 100-400mm f/4-6.3 in FF available making MFT unique when it comes to such setups.

 

Here's another example of a true APS-C setup vs FF:

http://camerasize.com/compact/#660.550,380.7,ha,t

 

Sigma 50-100mm f/1.8 vs Canon 70-200mm f/2.8 

 

The Canon lens is, again, slightly bigger because it's longer (160mm vs 200mm).