Just be careful and make sure you get the (less expensive) Micro 4/3 mount Panaleica 25/1.4. There is a 4/3 mount Panaleica 25/1.4, which is also quite good, but more expensive, larger and WOULD require an adapter.
I guess you mean the DG Summilux ASPH, not the D Summilux ASPH? Summilux just means f/1.4, and almost all recent Leica lens designs have aspherical elements, including both the 4/3 and Micro-4/3 designs.