I went to the Woodward Dream Cruise in Detroit this past weekend. Ford had 5 2015's (including a white anniversary one) on display. I got to sit in two of the five. The interior was really nice. Those toggle switches feel great. I feel like it is a big improvement over my 2005 (which was sadly totaled in February after almost 9 years of service (I was sole owner)). And I just picked up a connection for an A-Plan, so I may be picking one of these up.
How much smaller or bigger does it look then the s197
So, the third photo (with the three lined up) has a s197 behind it. Unfortunately I didn't take a photo of the two side by side. However, they were angle parked, so I'm not sure you'd have been able to tell anyways.
The hood's definitely lower, the roof is too. Getting into it didn't feel much different from my 2005 (although that was lower by 1.5" than stock). The tail looks much lower, but that may be because they don't have a pedestal spoiler option.
Overall the lines make the size look very deceiving. The whole car looks longer, but not necessarily wider (though it is).
One thing I hadn't noticed until just now is the lower half of the front bumper. You can really see it in the white (check the second and third photos) car in the angle I took the photos. Those wide openings with the thin, rounded vertical slices reminds me a LOT of a Mercedes AMG bumper.