Sorry, Ian, but, as I said, if you HAVE to compare them side by side, the difference isn't big enough for me to care about it!
Whatever makes you happy, buddy...personally, I'd prefer to compare side by side, and actually playing the instruments
instead of guessing.
You see, I am not the only person to perceive a big difference
in T3 and T4, there are many, which include some who use and play other brands, as well as Yamaha...of course, these people played and compared
the T3 to T4.
But, as always, your idea will work best...for you.