As sceptical I used to be about a 40mm lens so much a believer I am now. I was in serious doubt whether or not to get the 40/2 Rokkor for my CL. I gave in in the end when I could get one for 275 euro. It really is the best of both a 35mm wide angle and a 50mm normal lens. That Rokkor is really either and both at the same time.
If f1.4 is what you need, and a 40mm lens appeals to you, this could be very desireable lens. For me, I'm already very satisfied with my Rokkor, and I don't need f1.4. Besides, 50.000 yen ($450, or 400 euro?) goes a long way to the Epson R-D1 I'm saving up for.