Could you post some examples? I find the 25/1.7 great and I've compared it extensively to the 25/1.4 when I had the chance a few months ago. I couldn't see any measurable difference. Nobody else could either.
If you got some comparison shots I'd love to see them.
I do not. I bought the 25mm f1.7 when it first came out, as I had sold my 25mm f1.4 when I left M43 for a while, and had just gotten back into the format. The 25mm f1.4 produced the most remarkable output, so I was hoping the 25mm f1.7 would be somewhat close. It wasn't. I kept trying to like the thing, but every photo was just lacking something. I sold it a few months later. Fast forward to a couple of months ago, and I finally got another copy of the 25mm f1.4. It's everything the 25mm f1.7 was not.
So, the moral of the story is, yup, this is my subjective opinion based on having used both lenses (actually having used all 3), and no, I do not have comparison shots to show you. Someone out there might though, so keep asking, you may get lucky.
By the way, I had a similar experience back in my Nikon days, when I got the 50mm f1.8. It's got fabulous reviews because it is a very sharp, yet very cheap lens. I bought one, and absolutely hated its output, and could never figure out what I was doing wrong. Turns out...nothing. It is indeed very sharp, but it has ugly bokeh and just has no "magic" or whatever you want to call the things that make a really good lens special. The 25mm f1.7 impressed me in a very similar way. It's just murky and unpleasant.
-J