I look at the corner sharpness as well. The 50 mm f/1.4 is downright awful in the corners at f/1.4
And tell that to the people at SLRGear. Neither are sharp wide-open. The 50 mm f/1.8 is sharp in the centre (near the "1" region in the blur graph along the centre, which is quite good from SLRGear's methods) but isn't in the corners, while the 50 mm f/1.4 has a weird profile at f/1.4 and isn't even as sharp in the centre according to them. This is opposed to what Photozone.de says, which gives a bit of an edge along the centre when shooting wide-open.
Anyway, don't make your opinions sound so definite, and maybe you won't get into so many arguments. I think many people can disagree with you, and both of you may be right in some way. I'm not saying you're wrong. I haven't used the lens. However, it's not "just that way", like you said.
And the difference between SLRGear's assessment and Photozone.de's sharpness details along the centre of the lens (excluding the corner sharpness) is one reason I have always said you can't really trust lens reviews as being definite. The graphs are pretty, though.
To be frank, corner sharpness is really the LAST thing that is important for what a 50mm lens will be used for. You should know that in portrait photos corner sharpness is not very important, ESPECIALLY in such shallow depth of field photos if you would actually use f1.4.
Fact is, the f1.4 is sharper and better than the f1.8, and what you claim, that many say the f1.4 is soft, is just not true.
I know MANY people with a 50mm f1.4, and no one complains it is soft.
And besides, SLRgear comfirms this, they even state that the lens is TACK sharp over most of its aperture range.
And that SLRgear doesn't know how to reliably test lenses is not my problem. And maybe they had a damaged copy, if their copy was unsharp in the center.
But photozone.de actually does quite a good and careful job, and their findings most of the times match the results from the german photomagazine ColorFoto.
The fact that both photozone and ColorFoto come to the same assessments most of the time does show that photozone's test results are reliable.
Their conclusion on the 50mm f1.4:
"The EF 50mm f/1.4 USM showed an almost flawless performance during the lab- and field-tests both in terms of optical and mechanical quality. If I had to list a few negative points it would be vignetting and low contrast at f/1.4. So if you're looking for a lens in this class the EF 50mm f/1.4 USM is a great option."
I do not know about you, but in reality you would not use f1.4 very often. And the lens is a very good lens, and very attractive for portrait photography. And in portrait photography, who cares about softer edges when you would actually be using f1.4! You subject is in the center.
Here a 200% crop of the Canon 50mm f1.4 on the edge (not the corner) on s 5D fullframe(!!). At f8 i believe.
And here a 200% crop from the Nikon 50mm f1.4 on APS-C (D200).
http://www.digitalcamerainfo.com/co...o-Head-Review-/Performance--Image-Quality.htm
This shows the 50mm f1.4 Canon to perform well compared to the Nikon version... both in sharpness on its extreme edge (it was full frame) and in CA.
And if you actually care to read what real users have to say about it, you would know it is a very good lens. If you shift through the "reviews" on fredmiranda for instance, and discard the worthless "reviews", you will find it to be a very well liked lens.
http://www.fredmiranda.com/reviews/showproduct.php?product=29&sort=7&cat=2&page=3
All in all it is very safe to say that the 50mm f1.4 lens from Canon is a very much loved lens, and where you get from that often people complain on how soft it is is a mystery to me.