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For a general understanding of format equivalence, see Format-Equivalent Depth of Field and F-Stop.
Format equivalance quick summary for the GF lens lineup:
23mm f/4 ~= 18.9mm f/3.3
32-64mm f/4 ~= 26.3mm - 52.6mm f/3.3
45mm f/2.8 ~= 37mm f/2.3
63mm f/2.8 ~= 51.8mm f/2.3
110mm f/2 ~= 90.2mm f/1.6
120mm f/4 ~= 98.6mm f/3.3
Versus 36.0 X 24.0 mm sensor. Nominal focal lengths as per specifications; actual focal lengths of real lenses are usually rounded.
About comparing different aspect ratios
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