Yes, Jesper would certainly better the graph show above. It also shows the maximum values (one can get averages from the software too though) and a rock steady wind direction is assumed by the software. Both these aspects means that the graph is somewhat "optimistic".
In open and rough sea there are other factors to consider too. I was passed once on a downwind leg by Jesper. I was fully powered on my 10m2 sail and in the chicken-strap going very deep with the waves, when Jesper and Anders "Löcken" came blasting/jumping past me at a less deep angle but with a much higher speed and VMG.
As a side note, I was in Brisbane a few weeks ago and rented some Formula gear from Paddy, there are some very nice places for Formula sailing there!