With Chronext, a big Euro dealer, price of white 5711 is now above a WG 5711, altho it is preowned. Prices are rising weekly, for eg the 5164 moved up £2K in the last week, was under £26K then. 5167 has hit £20K, retail is £14K I believe.
https://www.chronext.co.uk/buy?q=5711