Sony is rumored to update the 135mm f/1.8 & 85mm f/1.4 prime lenses for A-mount cameras.
There is no exact announcement date leaked but Sony is expected to update their A-mount prime lenses in the next several months.
Rumor: Sony Will Update the 135mm f/1.8 & 85mm f/1.4 A-mount Prime Lenses Soon
The new A-mount prime lenses will have the same optical design changes when compared to the current ones. The main improvement will be the autofocus performance.
Zeiss Sonnar T* 135mm f/1.8 ZA lens is a high-quality lens and ideal for portrait photography in low light conditions for Sony A-mount cameras. It features 11 elements in 9 group with 9 circular diaphragm blades. The minimum focusing distance is 72mm and uses 77mm filter thread. The lens weighes 1,050 grams and currently priced for $1,700 at Amazon.