I didn't mean that they're all brilliant, the Pentax-M 50mm f2 is by far not as good as the 1.7, on the other hand, the Takumar 50 1.4 is far better than the f2. It all depends. In my experience it is like that.
The reality is that all this is anecdotal at best and there can be no resolution.
First, there is an unavoidable built in bias, for or against, by the user. It all depends on whether he/she has generally been pleased with the results from that lens.
Second, and even more important, all of these discussions are based on very limited samples, usually one lens. My f/2 lens could be absolutely magnificent while yours is a true dog. (I mean no disrespect to anyone's dog.) Variation is present in all lenses when new, that variation doesn't narrow as lens age. So, a small handful of discreet samples only show that we, as individuals, are happier with one lens, and not as happy with another.
There are other variables as well. I could be shooting my Pentax 50/2 at f4 to f8 under the majority of circumstances while I rarely touch my Pentax 50/1.4 unless I am shooting at f/1.4 or /2.
Finally, this is the internet. I may occasionally use a little extra emphasis when describing my fish in comparison to yours.
The truth is, I don't really shoot a lot of lenses, not nearly as many as I own. And a lot of what I use is used because of (shhh!!) habit. The lens on the front of my Zeiss Ikon, a favorite camera of mine, is usually either the C Sonnar 50/1.5 or the MS Optical Perar 35/3.5. And a lot of the time I use whatever is on it that day unless there is a good reason to change it.
But, from what I read here and on other forums, I am probably not the norm. It sounds as if a lot of people walk around with cameras bags complete with two or three spare lenses and perhaps a backup camera.
So what's the point. The point is that a sleeper lens for me is probably in use pretty regular, but I don't hear too many people talking about it on the various forums I visit. The Pentax M 50/2 is on my K1000 almost all the time. Why? Because it is light, compact and gives me good results in the situations I normally photograph in. It isn't really a sleeper for me. I know its strengths and weaknesses and I play to its strengths. But I don't hear a lot of talk about it. So, when I see a thread like this I throw it out there for others to consider. I really have no idea whether it is better than his Nikkor or your Zuiko. I may never have used those lenses in my life.
But hey! If you want to argue about it? I am happy to oblige. (But don't feel too bad about it, I don't really know if yours is better or not. I just like to argue.)
