I've been using Sony for about 2 months now and I'm impressed with the quality and build of the cameras and lenses. The system I have right now is the APS-C a6000 24MP small form factor camera with the 50mm OSS 1.8 Lens.
The lens is sharp and autofocus is very accurate. I primarily shoot wide open so primes with wide f-stops are very important. I can let in more light and keep my ISO down. I've not had any issues with the a6000 and high ISO though. The Sony sensor not susceptible to noise and allows you to turn it up when needed.
I have Nikon glass as well so I wanted to use that in my Sony camera. Fotodiox makes a handy little adapter that attaches to the body of the camera and a Nikon G lens for a full manual experience with your existing glass. On top of the adapter you'll find an aperture ring that allows you to dial it down for an "A" mode shooting experience.
All you need to do is adjust the ISO and shutter speed. Doing so on a Sony EVF or Electronic Viewfinder is a simple task. The back of the screen is WYSIWYG, in other words, you see the exposure you are going to make before you take the picture. Similar to Live View on a Nikon or Canon. All for around $59 USD you can keep using your existing glass from Sony/Nikon/Pentax/Voigtlander/etc
The folks at Borrowlenses.com have Sony kit and right now it's all 15% off your rental. Just use the link below and add items to your cart then use BLEVERYTHING15
hope you get a chance to try them out. It's a really enjoyable experience.