[Klaus]

I'd also say that Panas are somewhat inconsistent albeit not quite as bad as Sony's APS-C E-mount lenses or Sony A-mount lenses, let alone Samsung and Tokina. 

 

Oly used to be great but now they are just average.

 

I think it's unfair to use the Voigtlanders here - other than being non-IS primes they are also MF so their focusing unit can be very heavy (and tight).