This year Sixt Germany does not seems to have any Aston Martin’s in their fleet unlike last year. However there is selection of several M-series models and also Jaguar F-type both Cabrio and Coupe models.
BMW M-Series:
BMW M135 – 235 kW (320 hp) BMW M5 – 412 kW (560 hp) 
BMW M6 Cabrio – 412 kW (560 hp)
BMW M6 Coupe – 412 kW (560 hp) BMW 550d xDrive – 280 kW – (381 hp)
Other Premium / Luxury models:
Jaguar F-type Cabrio and Coupe
BMW 4-series Cabrio (F33) 
BMW 4-series Coupe (F32) 
BMW 6-series Cabrio (F12)
BMW 6-series Cabrio (F13) 
BMW 7-series (F01) 
BMW 6-series Grand Coupe (F06)
Porsche Cayanne