MFSL issues...

I'm more record collector rather than seeking the issue that sounds better such as MFSL or other re-issues on vinyl but it happend to me to spot a cheap MFSL of Led Zeppelin II and I realized that MFSL(particularly in this case) sounded totally different from original. There was no issue LZ II I heard with such extended bottom end and blooming-airy highs. The vocal was put background while the original issue has foreground vocal.
So, What's going on there? Did they equalize or boost bass before pressing?
It seems to me the case when they're trying to bring the record to the audiofile standard and if this is the case, I just bought the first and the last MFSL issue.