Water drops on smooth PTFE surfaces have been recorded to vary from 108 to 114 [Bernett and Zisman J. Phys Chem (1959) Vol 63 Page 1241] . Structured surfaces can enhance these values just as they can for other and low contact angle surfaces.
Interestingly, this max of 114 is not unique for PTFE. Highly purified paraffin wax exposing an array of methyl groups at the interface shows the same value. As far as I know, no other smooth surface exceeds this max of 114.
I question any values much larger than 114 on truly smooth surfaces. Inclusions of air pockets in the water-PTFA interface will greatly enhance the contact angle. If this knowledge is important for a specific application, I'd simply measure the contact angle at hand.
Results may also depend on measuring technique. I found the profile method the most reliable and reproducible.