I have the 1.7 version, and I am satisfied with it. From what I read prior to buying it, both (the 1.4 and the 1.7) are very good lenses, but for the general user, the 1.4 isn't worth the money. The difference between them is not enough to justify the price. But if you like really great lenses and can afford it, go for the 1.4. If you want a good lens and to do a smart buy (IMO), go for the 1.7.