The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic S 85mm F1.8 and the Leica APO-Summicron-SL 90mm F2 ASPH for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Leica APO-Summicron-SL 90mm F2 ASPH is the longer of the two lenses at 102mm. The Panasonic S 85mm F1.8 with a length of 82mm is 20mm shorter. On the other hand, the Panasonic S 85mm F1.8 has a larger diameter of 74mm compared to Leica APO-Summicron-SL 90mm F2 ASPH's 73mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Panasonic S 85mm F1.8 weighs 355g, which means it is 345g (49%) lighter than the Leica APO-Summicron-SL 90mm F2 ASPH which has a weight of 700g.
Below you can find the dimension and weight table of the 'Telephoto Prime Lenses in Leica L Mount for size comparison purposes.
Telephoto Prime Lenses in Leica L Mount for Size Comparison
Both Panasonic S 85mm F1.8 and Leica APO-Summicron-SL 90mm F2 ASPH has the same Leica L lens mount. Some of the latest released cameras that are compatible with the Leica L lenses are Panasonic S5 II, Panasonic S5 II X and Sigma fp L.
Panasonic S 85mm F1.8 is a prime lens with fixed focal lenght of 85mm. Leica APO-Summicron-SL 90mm F2 ASPH is a prime lens with fixed focal lenght of 90mm.