The 2.5 has the better shifters...mounted inside the brake lever housing. They are easier for most people to use than the bar-mounted independent shift levers the 2.7 model is spec'd with.
Just another feature the price difference buys you. You can go to Fuji's website and compare the two models, component for component to see what changes. A little bit here...a little bit there. For a detailed look at the components and how they function hit up the shimaNO or other manufacturer's webpages.
The 2.5 also throws in some cheap pedals/toe clips, a better cassette and a better crankset.
ShimaNO is particularly good in that you can download exploded views of the components, parts lists, user manuals and dealer service manuals for almost all the components shimaNO manufactures. Be advised that most of shimaNo's low end components are manufactured in China, Taiwan, Korea, etc. with all the good and bad that comes with that. Reading the online reviews will tell you that Fuji bikes, in general, are great bikes and the lower range shimaNO components are perfectly fine for light duty to moderate use applications.
Either Sportif model would be with you through grad school with a little care and a few replacement parts as they wear out.
I think the biggest draw for the 2.5 is the 3-pound weight loss. Loading and unloading the bike from a car or rack, carrying it a flight of stairs...you'll probably notice that three pound difference there as much as when riding in hilly terrain.