I love doing macro work but have only used a Sigma 70-200mm 4.0-5.6 as you can see from the lens test a few posts below. I have decided to get a dedicated macro lens and am now faced with a dilemma: do I choose the Panasonic/Leica 45mm or the Olympus 60mm? Both are 2.8. I absolutely love my Leica 25 1.4, pretty much attached to my GH2 all the time. It reminds me so much of my Pentax K1000 with its 50mm that I used to photograph with. Problem is that the Leica is $1000 as opposed to the $500 for the Olympus. And since I already have the adapter I will get auto focus with the Olympus but just no image stabilization.
UPDATE: Based on initial reviews, it appears that the Olympus is the way to go.
More to come!
Here are a couple from the Sigma: