Yes, it is the season. Had some good ones at Le Grand Pan the other night. Chez l'Ami Jean will have some as well. But in general, quality fresh morels are a rarity, including at quality bistrots. Joséphine's stuffed ones are decent, not great. L'Auberge Bressane is quite good morel dishes (dried based, no questions). Sometimes Senderens has awesome ones. Also, had a very good dish of morels and poached egg at Tante Louise last week.
But the thing is, top quality fresh morels can only be the day's specials, because there's no stable supply of them.