4th year med student here. I'm considering doing the same thing. I've had an iPhone 5 and an iPad Mini Retina that I've used on the wards and it's been great. I've used the Epic iPad app (Canto) and hoping to do the same with the 6 Plus.
Looking at getting a 64 6 Plus as soon as I'm able. My wife and I are both eligible for upgrades with ATT right now.
On a side note, I just found out that NotesPlus is being made for the 6 Plus. That's one app I've used on the iPad and iPad Mini quite a bit.
Getting the following case:
http://shop.thenoduscollection.com/products/pre-order-access-case-for-iphone-6-plus-5-5-inch
Would love to hear from more med students, residents and attendings on this thread re: the specific question from the OP.