That one thing m4/3 don't have to worry about is dust in the Viewfinder I've read so many posts in the past were people have suffered from dust in the viewfinder, Canon being the worst for it for some reason even when bought new from the store. But eventually it does and will happen depending on how your store your mirror slapping camera. Having an EVF or not having one at all, get rid of this annoying problem. And with the SSWF on the sensor being best version for shifting dust. dust problems with m4/3 becomes a none issuse. Only the lenses will have problem with dust but that itself isn't really an issuse as it doesn't effect the lens one single bit, unless you leave it in some dusty corner for months.