It was 1/48th as standard for film, most places. British DPs have been known to shoot 1/50th due to their power cycling and flicker.

You may have been reacting to the extra crispy nature of high shutter footage. Perhaps it has to do with less motion blur in those older, slower stocks (just guessing). But I can't think of a single older film, much less a trend, where shooting at high shutter speeds was any sort of standard.

Motion of figures can be quite distracting, to me, when shot this way. I'll pick it out very quickly when I see some modern drama where the DP shutters for flicker on location. Looks great for sports though.

I have experienced the same thing with my GH1 using the Sopelem 20-100 zoom (it vignettes a bit - fine on the Nikon 1, so it will work on the BMPCC). Shooting outside with the high shutter speeds it looked really good even though I felt like I was breaking some fundament cinema law. I was shooting an action scene with someone climbing on moving car and it stayed clear without much motion blur which was ideal.

Standard film speed is 1/24th. Shooting at 1/25th is more to do with PAL television frame rates

@mrbill he's discussing shutter speed, not frame speed. Shutter speed is nominally twice your frame speed.