I have the same problem. I use LR 5.4. for Windows 8 and Windows
When you use a second monitor to show the image, this appears unsharp. This anomaly dissapear when you apply some adjust, but is very unpractice.
The same occurs to other collegues with different monitors and different computers.
It is a already known problem widely documented in internet, but Adobe is not attending the situation.
¡¡ Penalty for Adobe !!