A little background first: I'm a casual amateur. I have the two slow Panasonic zooms (12-32 and 35-100) for when I'm with family and don't have time to change lenses or choose a location. Perfectly happy with the pair. As far as focal lengths go, I seem to regard about 15-20 as 'normal' for me, with a slight preference for wider. I've tried many m43 primes in various combinations, and have just added the Panasonic 15mm to my Olympus 25mm and Sigma 60mm. I use the 15mm a lot, as I like the FOV, and the 60 is great for head and shoulders portraits. Since the 15mm, I use the 25 very rarely. I prefer to take 2 steps forward and use the 15. So I am considering selling both the 25 and the 60 for an Olympus 45. I used to have the 45 and it's fine for the head and shoulders shots I like. Any suggestions or recommendations? What about alternate 42-45 lenses?