The Sunfast 37 is a nice boat and faster than a Sun Odyssey but not that faster
The boats share the same hull while the Sunfast has better sail controls and a bigger draft.
One of my the nice sail memories was a passage between Leix§es (Porto) and Figueira da Foz: lots of wind and downwind sailing. Some hours before my family was able to shower and get ready to sail, leaved the same marina a Sun fast 37 . When I arrived at Figueira da Foz I was directed to berth alongside it.
The boat belonged to a very nice French, that help me alongside. He was very happy with the great sailing day and he was very satisfied with his boat performance. He said to me that he had made an average of 7.4K and asked me how much time I had took: I look at the watch, asked my wife the departure time and tell him.
Well, his smile was not that big anymore
. I had no idea of the average speed, only know that I had had a great sailing day. It turned out that I had made an average speed well over 8K. That does not mean that my Bavaria 36 was faster than his Sunfast 37 ( but it is more fast than the actual Bavaria 36) since I had been having fun and rarely had used the autopilot on all voyage (broached slightly two times). The point is the Sunfast 37 is not that fast.
From that vintage a First 36.7 or an Dehler 36 are way faster. If you can find a Dehler 36, it is a beautiful and great boat. Of course the Sunfast, even if not as fast, is also a great boat and probably not as expensive as the Dehler.