It's too broad a questions to give a definitive answer as the "vintage receivers that everyone is gaga over" category includes a huge number that are very different in terms of sonic signature and overall quality.
Having had many vintage receivers and having sold Arcam in previous generations, I would bet that yours would be in the upper ranges of the group IF the criteria include being faithful to the original signal being passed on. A lot of vintage receivers have a nice sound but are very inaccurate. Some probably were not that neutral to begin with, others have deteriorated over time. Some can sound stunning. My Yamaha CR-2040 destroyed an Audiolab 8000A, another very good integrated amp I used to sell. Others are fun but very boosted in the bass and closed in sounding compared to your Arcam which will be more accurate, precise and open.
To be any more specific than that you would have to go up against individual models and compare IMO.