That 250/4 is a stunning lens but not a practical focal length for general purpose portraiture. It wouldnt be my first choice if I'm just starting to build a portrait kit.
I have the gf 110/2 and it is great. You cant fault it but it never wowed me either.
The lenses that honestly takes my breath away are the Sigma 105/1.4 and 135/1.8 with a fringer on the gfx. Extremely sharp with amazing bokeh. The 105 is a beast, the 135 is a lot more holdable. In return you will get shots the 110/2 as good as it is simply cannot match.
