Vaginal sex may or not be possible, it depends on your anatomy and how the surgery is performed. Be sure to discuss this with your surgeon.
How post-op sex feels will depend a lot on how sex feels for you now. For example, some guys experience a lot of internal sensation, while other guys feel most of their sensation in their dicks. Sex will also probably feel different post-op in the sense that the surgery is successful, relieving dysphoria and amplifying sexual response, including in the brain.
Joshua