What do I think is really cool about l-mount?
I love to have the smallest and lightest full frame camera available! Also if the camera would be an APSC camera, it would be still the lightest I know! So the Sigma fp L is in my opinion the best choice for multi day mountaineering or trekking, hiking and bike packing to photograph nature, landscape, macros...
For macro the Panasonic 100mm f2.8 is perfect, because it is the lightest full frame macro!
So for me I'm interested in a light setup to combine it with the light camera!
My actual setup for hiking with a lot of altitude is the Panasonic 24mm/ f1.8 and as telephoto lens the Panasonic 85mm f1.8 or 100mm 2.8, because they are light with a very good quality and weather sealed!
If I don't want tho change lenses I use only the Sigma 28-70 f2.8.
For landscape I use digital cropping very much, but still need more tele, so for me a weather sealed ~135mm or ~150mm f4 as light as possible would be great!
And / or a ~28-150mm f~2.8-4 as light as possible with good quality and weather protection!
I'm not interested in lenses heavier than ~500g, my only exception is the Sigma 100-400, but I don't carry this lens more than a few hours around. For landscape I walk for days or weeks, so everything has to be light!