so for anyone that wants to try, the EF 15mm 2.8 Profile with a Distortion of 40 also looks decent. I compared the "corrected" photo to a EF 16-35 and you are getting a wider FOV even when corrected compared to the EF 16-35.
These were taken from the exact same distance, the 16-35 due to its length with the adapter appears to be closer slightly.
The first is the 16mm with the EF 15 profile. The second is the EF 16-35 @16mm. Both at f8.0 100 iso