Also, there's focus to contend with. The A6000 does okay with the Sony 50mm on auto focus. Just okay. Sometimes I'd rather manual focus, but the lens is not good for manual focus on the fly. I don't imagine the 55mm is much better for manual focus, and the A7 may be worse for auto focus. That's not really a sensor size issue, per se, except when looking at manual focus lenses.
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That's not absurd. It's the most logical way to demonstrate the efficacy of a camera for a particular photo. Isn't it? I thought that was one of the key points of the video that spawned this entire discussion, that talking about specs in a vacuum is what's absurd.
If anyone has input on how to get more out of the A6000 for concert photography, or if you think I'm just barking up the wrong tree trying to use that camera for these kinds of photos, I'm interested in hearing the feedback and seeing examples that show the concepts.
Thanks.