Not quite the impression I got.
It's not that important. Prove it or don't; it's up to you. 
No, it's not important. But it is interesting that two people can hold such different views about something that I would think is very basic and obvious.
Your position is that there is no difference that the pilot can feel between the two aircraft. Any feeling that the La7 performs better is subjective and wrong as proved by the speed and climb charts.
I think it is so obvious that I am right, there is a difference and an experienced player can definitely feel it, that there really is not point trying to prove it to you.
So...how about:
You prove that there is no discernible difference that one can feel between the two and then I might take your position more seriously. Don't keep stubbornly throwing those speed charts at me, it makes you seem ignorant to base how the aircraft 'feels to fly' on a speed chart.