I just got back from the microsoft store and while the 15 is larger, it is not by that much in my opinion. I called Microsoft and they told me the specs internally are the same on the higher end 13.5 model to the 15 other than the GPU. Structural wise they are identical. Why people are saying the 13.5 is the same as last year i have no idea. Its the same size but thats it. Its a completely different laptop.
The 13.5 due to the aspect ratio provides more surface area than a 16:9 13.3 laptop. The surface dimensions of the 13.5 model is 84.11 sq inches compared to 75.57 for a 13.3 16:9 laptop. Thats a whole ten inches. Compared to a 16:9 15.6 laptop the difference is only 20 sq inches at 104sq in compared to 84.11 for the 13.5 inch SB2.
The 15 SB2 has a sq in area of 103.8, almost the same exact of sq in area of a 15.6 16:9 laptop. The only dirrerence i see between the 13.5 SB2 and the 15 SB2 is 1.5 inches and a better GPU. Is it worth it considering a $400 dollar price difference between the higher priced i7 models?