A lens is not just a lens. There is something about certain lenses which impart a magical feel to images. This is the first lens I have owned on the mFT mount that gives images a beautiful feel and vibrancy. While the Panasonic 20mm f1.7 is sharp and pretty much flawless, this lens adds some pixie dust to the images - they sparkle. In a straight comparison with my 20mm f1.7, the 25mm f1.4 seems sharper still and with much punchier colours and smoother bokeh. The Leica also focuses noticeably faster on my Olympus OM-D. While the Leica is by no measure "cheap", Panasonic has, at least, included a flare guard and bag along with the front and rear caps. You don't always get those, even with high-end lenses.
I know this is sounding like hyperbole, but I genuinely feel this way. I also have a Canon kit and this lens imparts a similar quality to Canon's L lenses. Leica will probably laugh at that as they were there first in terms great lenses. However, in this case, you do get what you pay for. The problem is, it's hard to quantify in words what that extra magic is.
What I can quantify is that the 35mm equivalent FoV of 50mm and fast max aperture of f1.4 make this a very flexible lens, suitable for most conditions. While we are used to zoom lenses to cover all angles, a 50mm prime remains a great all-purpose perspective. And Leica 50mms are legendary. This example keeps the reputation alive.
This lens has taken my OM-D from perfectly competent to outright fantastic. Well worth the money.