that’s because the colors of the grid and wireframes are additive, i think it’s to prevent z-fighting ,so u should change one of them.
This is not Wireframe mode only related, but I do not know exactly where to mention it.
About User Preferences > Interface > Line Width
Here we have had a little confusion, starting from here:
https://blenderartists.org/t/blender-2-8-viewport-updates/1114082/464
To be honest, I also thought that that configuration only affected UI, and not viewport/editors.
Could it be decoupled in different options, keeping these in Interface for UI lines, but editors line thickness to be in Theme configuration?
Currently there are similar configurations from the Theme settings, such as Vertex or Outline size.
I know that there are other Viewport configurations under Interface item in User Preferences, but particularly line thickness I think it would be important that they are decoupled in two different ones for UI and Editors.
That setting is for high DPI displays, where it makes sense to make all lines in the UI thicker, including wireframes. If people are using it as a theming option, perhaps it should just be named better to avoid that. With the default 2.7x theme it looked obviously quite bad on low DPI displays, but with the new 2.8x dark theme it’s not so obvious anymore.
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Oh, that’s the intention, it makes sense.
Originally I had thought that maybe that option was only for those who wanted to have a better visible dividing line in UI.
Yes! That would also be awesome for retopology. Please!!! 
Currently the wireframe remains unusable to work in blender 2.8 here a clear example with the empty background.
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I think in this case you should have activated the “In Front” (old object x-ray), in the object Viewport Display options, so that the sphere is drawn completely in front of the empty plane. Or those screenshots are with that option active?
The previous images had the default xray when you press z and choose wireframe, now I have tested with xray
I hope it can be fixed. Maybe @fclem knows something about it.
I’m testing on 2.7 and the problem seems to be empty image itself.
This would be a good reason to return to the traditional background image instead of using these empty images. With the image background from a camera in 2.8, you can see that if it works better than with the empty image
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I might be missing something very obvious but what’s the issue exactly?
Your mesh seems to be intersecting with the image empty, which shouldn’t. So how about move the image empty back a bit so it’s not intersectng? That way it should behave like a background image… 
The sphere with wireframe is a gray blur stain, does not distinguish the wireframe, I think it’s obvious that it’s wrong, even if it’s in between the empty image, it should look good. With the traditional background image it works perfectly, as I demonstrate when using the image background, that is currently only available from a camera.
Get out of edit mode and tell me if it looks like professional software what you see on screen
It happens whenever an object is behind something with transparency. I ran into the same issue working on a cosmonaut. I had to hide the glass shield on the front of the helmet to adjust verts on the guys face. I started out with a refractive surface for the glass and tried making it just transparent - neither one worked. This was on a 980 gtx. I haven’t tried it on my p4000 at work but I think the issue is one of the shaders being used and not a hardware issue.
Is your sphere penetrating the image plane?
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Oh, I thought you were talking about the edit mode, So yeah, in object mode it looks a little weird.
No.
@DanPool “Is your sphere penetrating the image plane?”
Yes, it’s intersecting.
I thought in this image it was clear:
Yeah I could tell with yours. I couldn’t with RedWaxPolice’s.
Why would you leave it intersecting like this?
You modeled in half of a model and with the modifier mirror you dont need modeling the other half of the model, is a common practice in modeling
I know the modeling practice. But with image planes is also a commom practice to put them behind the mesh. So it behaves like a normal background image.