OK, that's nice to know but is there some reason they don't seem to want to provide direct comparisons between all their cameras? I don't mean to come across as snarky but if they want me to give them $4k for something I feel they need to do more than tout benefits without providing proof of benefit. I'm very, very close to placing an order but until they step up with the info I'm still looking at a custom build for 4x the cost of the 520. Then again, I know exactly with the custom build will do, which means I would not have to buy something else should the unanswered question with the 520 turn into deficiencies.
I also still have problems with the battery charger in the kit either way. For what they are selling, a pro level tool, the least they could do is provide hobby level battery chargers.