Decent comparison Dzmitry. Doing comparisons is tough.
I have both lenses also, but tend to take in the aggregate point-of-view when comparing lenses.
In the aggregate, I think the new Sony ZA 50/1.4 is better by more than a small margin. Whether it is worth 3X the price depends on how much one uses a 50mm and what they expect from it. Personally, I would have liked to see this lens more in the $1,000 range.
Over-all comparison: the ZA is a sealed lens; has SSM AF which is both faster and smoother, has the DMF button and is nicer to use manually, and has the focus hold button. The metal lens has a better build quality, a rear focusing group for better close-up performance, and takes a 72mm filter like other ZA lenses (the Sony 50/1.4 uses a 55mm). Over-all I find it very well balanced on the A99, and is now my most used Sony lens (at least for now ... LOL!).
IQ: This is always a tough evaluation because the differences are often subtile between a less expensive lens and a more expensive one. Frequently, you have to pay a lot to get incremental gains. Which is why I look at the aggregate to see what else is gained.
In your test shots, I see certain image characteristics I tend to expect from a ZA lens: Assuming care was exercised when matching focus points, the f/1.4 Teddy Bear images shows a clear acuteness on the bear's face that is missing in the Sony 50/1.4.
The bunny figurines show a bit more crisp contrast and subtile color separation evident in the painted flowers with the ZA, and if you look at the glass topper in the background the ZA's specular highlights are rounder/cleaner than the Sony 50/1.4 ... and over-all tonal roll-off of OOF areas being more gradual and smooth in a typical Zeiss manner.
I couldn't really evaluate the Espresso machine image as the focus points and exposures were different.
The Tiny Toys shot is also revealing ... while the center areas of the two comparisons read out almost exactly the same, the vignetting from the Sony 50 is quite obvious.
Although I've use the lens quite a bit already, I have no definitive opinion on the ZA50/1.4 and need to use it in more situations. I do like that it seems to produce images that look seamless when included in with other ZA focal length images ... especially skin tones that have a very nice tonal spread and less artifacts than my experiences with the Sony 50/1.4.
Not that the Sony version is a slouch ... I was going to sell it, but since have reconsidered, and will try it on the A7R when I get it since it is the smaller of the two Sony 50/1.4 lenses.
- Marc