Vignetting
F-stop Voigtlander Nokton 25mm f/0.95 Panasonic 25mm f/1.4 Leica DG Summiflex Panasonic G X 12-35mm f/2.8 Panasonic 14-45mm f/3.5-5.6 Panasonic 20mm f/1.7
0.95 -2.41EV        
1.4 -1.35EV -1.94EV      
1.7         -1.50EV
2 -0.509EV -0.85EV     -1.11EV
2.8 -0.125EV -0.195EV -0.664EV   -0.666EV
4 -0.125EV -0.168EV -0.371EV   -0.421EV
4.9       -0.205EV  
5.6     -0.274EV -0.204EV -0.359EV
8     -0.28EV -0.043EV -0.382EV