I did it. I have sold my pana 20mm and Oly 45mm and bought the Pana Leica 25mm 1.4.
It was a gamble and I was really nerveous and anxious for my first real shooting day. I hoped I could justify the sale and the high price of the Pana Leica.
The first thing that catched my eye was the size. Compared to the 20mm this lens is really big ! It is like having a legacy lens on your cam.
That's a real big disadvantage compared to the Pancake and the Oly 45mm.
But Ok, I always wear my PEN on a strap around my neck and I'm used to carry a lot of big legacy lenses.
Today I went to a playground with my daughter and shot alot of pictures and I must say that I'm really happy with IQ. The lens is sharp, contrasty, bright and has a really nice bokeh.
So compared to the 20mm I would conclude :
Cons : Big, Expensive
Pros : IQ, Bokeh
If compactness it is what you want, then go for the 20mm.
Here some samples of my Father-daughter day; Hope you like them.
#1
angel in the back seat... by
G.Don, on Flickr
#2
hide and seek... by
G.Don, on Flickr
#3
Let me in ! by
G.Don, on Flickr
#4
No pictures please ! by
G.Don, on Flickr
#5 (softened to hide rimples

)
Who's this ? by
G.Don, on Flickr
#6
I'm so cool... by
G.Don, on Flickr