The mini 35mm film lense adapter mentioned before is definatley the way to go. It will fit 35mm prime lenses to your XL1. rent it, and some lenses.(posted 7517 days ago)Mentioned also was the XL1 and 24 fps mode.. not true.. it is still 30fps, just progressive scan. i.e. no fields.
Shoot with fields and use Magic Bullet from the orphanage. its a bunch of ex- ILM guys who wrote this amazing AE plug-in that simulates tons of film stocks, and also uses interlaced footage to interpret perfect 24p masters to send out fort 35mm tansfer.
you're shooting on video, it will never look as good as film