BikeRadar just posted a video on their test of various deep section wheel. Wheels were tested with
1) Michelin Power 25mm
2) at 5 degrees, 12.5 degrees
3) on Orbea Ordu OMP with 3T Revo front end, KASK helmet
4) Rider does a lot of tests for 220triathlon / BikeRadar, seems able to hold power fairly consistent from ride to ride
5) Wind tunnel at University of South Hampton, with rider at speed, wind speed not specified
6) also subjectively tested for breaking (dry and wet), cross wind stability

They rated these wheels using a combined score (you'll see them in the youtube video), but I think 5 degree yaw angle drag is of most interest to us here and the results were:

https://www.youtube.com/watch?v=h0BH3wXzhrI&t=0s

I assume measure here in watts are with rider on board (5 degree yaw results only)

1) 373w: ENVE 7.8:
2) 374w: Zipp 808 NSW
3) 379w: HED JET Black 6/9
4) 380w: DT Swiss RRC 65
5) 381w: Knight 95
6) 386w: Progress Space
7) 388w: Vision Metron 55/81
7) 388w: Profile Design 78 24
9) 408w: Roval CLX64
10) 410w: Mavic CXR

EDIT: On 2nd thought, the unit might be grams of drag. Assuming the wind tunnel was running at 30mph, then 10g = ~1 watt. This seems more reasonable and makes the performance of each wheel much closer to each other