Yes, we are talking about dimensions. That is how volume is measured. We live life in a real, physical world.
Yes, Stevie Wonder could tell the difference. And, on this forum the rest of us can see the difference.
Some of us even shoot the K-01 quite a bit, and are aware of how it compares in real life size, feel and appearance compared to the dSLRs we also shoot.
So, obviously with your strong understanding you have shot with it. Except you haven't looked at the differences. Don't squint. You might miss it.
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