My wishlist for existing lenses:
Canon EF 85mm F1.2L
Canon EF 35mm F1.4L
Canon EF 135mm F2.0L
Canon EF 24mm F1.4L II
Canon EF 300mm
Canon EF 14mm F2.8L II
Canon EF 500/600mm

What I would wish for that don't exist now would be a quicker 85mm 1.2L :P