Off-topic, so my apologies, but Victoria & Alberts definitely serves the best coffee on property (although it's a bit difficult to get since you'll need a much-coveted reservation for dinner to go along with it)! If you've never seen the vacuum brewer they use to brew your coffee tableside, look it up on YouTube. It's such a wonderful experience in person. One of my favorite memories at WDW.
V&A's, like all other restaurants at WDW, serves Joffrey's beans. There are specific blends/roasts made for many of the restaurants on property (V&A, Cali Grill, Flying Fish, Jiko, Brown Derby, the Wave, etc), which is really a neat touch. Most are very good. Personally I find the Joffrey's beans far superior to your typical Starbucks over-roasted stuff, but that's more of a personal preference. There are many options on property and definitely better than the Nescafé days of the past, thank goodness!