1. Much quieter and faster when focusing because USM autofocus. 2. Slightly faster 3. Bayonet made of metal and not plastic, which means less wear and tear and a more accurate back focus 4. More valuable feeling 5. Both have the disadvantage that the lens changes its length when focusing. 6. With both, there should be no pressure on the lens barrel, so always leave the lens hood in the working position. 7. Both offer good value for money. 8. Haven't regretted the change. 

Could you please update us your full Minolta lens model ?as Minolta has MD MC and AF mount, K&F Concept MD-M4/3 is suitable for: Lens: Minolta MD MC Mount lens(not for Minolta AF mount: KF06.157) Camera: Micro 4/3 (MFT) mount mirrorless camera like Olympus PEN, OM-D series, Panasonic Lumix DMC-G1, G2, G3, G10, GX1, GH1, GH2, GF1, GF2, GF3, GF5, GH4, Panasonic AG-AF100 Mirrorless Digital Cameras, Black Magic Pocket Cinema Camera (BMPCC) 

Yes. I have the same lens and adaptor on my Sony a7ll and it works beautifully. The m42 is also known as the 'universal' mount as other 3rd party camera and lenses also used it. I own 6 other K&F e-mount adaptors to different lens makers (ltm, MD, CF/CD, Nikon) and they all are well built with a nice snug fit. Highly recommended. 

Yes, the Nikkor 50mm 1.4d is an f mount lens so it should adapt just fine. 

They are universal....they fit on my Canon and my Fuji 58mm lens.