I think the Orbea fits quite a bit differently than the other three in almost all of the sizes.
The Cervelo and Felt from what I know of bike are more aerodynamic than the Quintana Roo.
Here's my take:
The Cervelo. Components are proven, no nonsense, good quality componentry. Shimano Ultegra all the way through except FSA brakes and cranks, Shimano wheels, also some nice touches like Vision brake levers and a Fizik Arione tri seat.
The Felt. It's probably more aerodynamic out of the box with the 40mm deep wheels. Yet Felt is sneaking in a lot of their name branded components to keep costs down while giving you "more bike", like the Felt wheels, Felt saddle, Felt aerobar, and Microshift shifters, etc.
The Quintana Roo is a different bike altogether. It's a little bit down specced compared to the Cervelo and Felt. Proven frameset thats been around forever in different iterations.
I own a Felt B2 and a lot of times wish I had gone with the P2.