Master Crimzon
Baby Killer
Agen Kolar went up against Quinlan Vos in a lightsaber duel (and totally tooled him). Kit Fisto duelled against both AotC levelled Obi-Wan (and tooled him) and went up against Asajj Ventress in a duel. Fail.
Oh, and I suppose it doesn't count that Sidious obliterated three of the order's greatest swordsmen? Not just at that period, when people on the level of Obi-Wan and Anakin were in the Jedi Order, but in its entire history.
Dooku, being a better practiced swordsman than Sidious, is likely more technically skilled- however, Sidious is a "Master of every weapon and every form", and was capable of moving and striking at speeds that nearly overwhelmed Mace Windu, who was forced to resort to Vaapad in order to mimic Sidious' speed, put Yoda (who outclassed Dooku) on the defensive, and those speeds being called 'furious' and a 'blur of speed'. He's faster than Dooku, more powerful in the force, and therefore capable of enhancing his attributes to a far greater extent than Dooku; stronger, faster, better reflexes, better agility... and seeing as Anakin was able to own Dooku using his force attunement and strength, I have no doubt Sidious, given his advantages, can do the same. He defeats Dooku with difficulty in a lightsaber duel.
The entire fight? Grievous is disabled with the force, the droids are casually brushed away and Dooku is defeated in a lightsaber duel.