I got my 270 gyuto years ago from the aframes and don't know the thickness difference between 240 and 270.
It took long time for me to thin it and to put convex grind on the right side.
(the steel of it was very sticky on my stones until I removed factory grind lines on the suface of the blade).
Now it performs really great - just a little shy of Shige laser but it is a real tank.
I hope you still enjoy your knife. :-)
Originally Posted by RR13
so the 270s are definitely way thicker than 240s? damn.
Quite a bit thicker. The 270 feels like a bulldozer compared to the 240. It's hard to beat that retention though.