Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Will a 1.4 f stop canon lens remain 1.4 on the Sony A7 body? Will the f-stop of the lens be accurately communicated to the new body?
Document: This is an impressive (and complex) piece of gear. I'd give it five stars, except for two problems:1) Slow automatic focusing , minus one star.A lens, like the Canon 24-105mm f/4 zoom or the Tamron 24-70mm f2.8 zoom, that achieves quick focus when mounted on a Canon body, will hunt from near to far before it achieves focus when mounted on a Sony body via this adapter.
After purchasing an NEX-6, I purchased the Metabones Adapter so I could use my Canon lenses. I was looking forward  to trying my L lenses on this new, light camera.Well - evidently, I had a defective one. It happens. But if a unit is defective, a responsible company will make it right. Not Metabones.4 of my 5 lenses simply would not attach. When I tried to put the lens onto the Adapter, the lens would turn maybe 1 mm.
Bought this to use with my new A7r and my collection of Canon L glass. Works great, very professional design with a tight fit on the body. Wide angles like the Canon EF 16-35mm f/2.8L II worked great with full aperture control from the body. Focusing is a tad slow like using live view on a Canon body, the native Zeiss 35mm f/2.8 is noticeably faster.
It's exceptionally expensive, the supplier sold me version 3 not the new version 4 which is the same price. The adaptor moves slightly on the body which undoubtedly adds to the shutter vibration issue of the Sony A7r. Because of that movement there's a notorious problem - accepted by Sony - with light leak. Not something noticeable in everyday photography but it's still an issue which shows poor machining.
I've tried 4 Canon lenses and the only one that doesn't autofocus is the 50mm f1.8 lens, all others work fine. In this respect my Commlite adapter works better although that is only an APS-C adapter and not full frame like this one.Autofocus does take a bit longer than using the lens on a native Canon body and sometimes there can be quite a bit of hunting going on, although this is more the exception than the rule.
Tested a Zeiss Distagon 21 f2.8, a Canon 70 to 200 f2.8 and a Tamron 28 to 75 f2.8. All work perfectly and the adaptor passes all lens info to the Sony A7.
Was a little tight when first putting it on the camera and mounting a lens, but is now working smoothly. Auto focus moves the lens and is slow on all lenses I tried. (50mm 1.4, 24-105, 14mm 2.8 ver II) but the resulting focus is not accurate. It might be ok for snapshot sized photos, but no way accurate for larger ones.
The build of this thing is really nice. It's very solid and the lenses fit tight. But I have frequent problems. It often times doesn't recognize my lens and the Fstop indicator will just be blinking. I have to reattach the lens then it works.Then, sometimes when my lens is working and it does recognize it, it won't adjust the f stop based on my camera settings unless I'm recording or taking a picture.
This adapter should be a fantastic buy for A7/r owners because many  Canon lenses are far better optically than comparable Zeiss - Sony lenses ( see the DXO web site.) But  my metabones III would not accept the Canon 24-70 L IC USM lens. It fit the A7r just fine, but the lens could only be turned about 30deg before becoming too tight whereas a full 60 deg turn is required to click it in and engage the Canon and Metabones III electronic pins.
Very happy with this purchase given the small native Sony lens selection at the A7R's launch. A must buy item as far as I'm concerned if you have any other glass from another camera manufacturer and are just jumping into the Sony world with the A7-series like I am.
Answer: Hey there. Yes, the information will be sent back and forth flawlessly. Some cameras state the f-stop in odd numbers, but it is actually the proper f-stop. Be Aware! I got this and ended up getting the Mark III instead of the Mark IV and neither Amazon or Adorama will respond to me to rectify this. The adapter is fantastic, but get it from another source.