GF 1 still uses M4/3 native bayonet automatic head. Plus those manual pan/tilt that need to be switched, the volume advantage is gone. Without volume advantage, it is better to use SLR. Moreover, the telephoto manual pan/tilt must be equipped with EVF, otherwise it is extremely difficult to use.

If you have to do it manually, only one is recommended, 25mm F0.95 from Fu Lunda. Primary M4/3 bayonet, installed on GF 1, equivalent to 50mm header. 0.95 super aperture.