GF1 as a 5D replacement for portraits?

The Leica 50mm Summicron is effectively a 100mm f/2 lens, so one would think it would be great for portraits right? 

Since I only only take portraits with natural light, indoor portraits are kind of a touchy subject with this camera. I think I can pull a lot more detail using the 5D if I have to use any ISO above 200. But in daylight the GF1 is perfectly usable.

Incredibly lucky that I had my camera out today as I was heading back home from class, and bumped into my friend Chunyi at the bus stop. The GF1 + Leica 50mm Summicron combo is very hard to control at f/2, but if you can nail the focus... the results are outstanding.

Woke up at 2pm and went online to see everyone say "Wow what a nice day!" "It's so beautiful outside!"

Lingered around the house for a bit... then said, "OKAY, GET OUT OF THE DOOR LET'S GO!"

I had to do some reading... and since lugging a 5D with a heavy backpack would have been a pain, I opted to give my GF1 a chance. Very pleased with the results =).

Tested the Leica 50mm summicron on the GF1, it's pretty darn hard to focus. Using any lens on a GF1 will give you 2x more focal length. So effectively the 50mm acts like a 100mm. The following are a mix of the summicron and the normal 20mm f/1.7