I just bought a DA-2 for my F3HP. The action finder, although differant has the same effect as the WLF in that it effects critical focusing in a bad way making it harder to focus. Seems that the enlarged image is magnified less. I'm not disappointed because for quick action it will serve its purpose.
Are you aware that the image will appear upside down and left and right will be inversed on a Nikon WLF? Not sure of your intended purpose? Street photograpy?
Confused? I'll explain by comparing the veiwfinders on my F2 and my F3 with HP viewfinder. The image on the HP viewfinder appears larger, but under dimm lighting it is easier and faster to focus on my F2. It is totally counterintuitive, but the enlarged image provided by the HP finder is dimmer because it is spread over a larger viewing area. The action finder exaggerates the effect of the HP. Of course this is not an issue with lots of light, but the F2 has a better viewfinder for low light.
I expect, that with a fast lens (F 1.4) you might be using it for low lighting and hand held photograpy. I would favor a F, or F2 over the newer Nikon professional cameras that all have adopted the HP style of viewing.
By way of explaination I would express that I perfer the Nikon Professional Cameras as being the F, F2, F3,F4,F5... all which display 100% of the image that will be exposed on the negitive.
Some of the non-professional cameras only display 92%. Right now there are a lot of old F's and F2's available because they have proven themselves durable and seem to never die. I wouldn't be so afraid of the size and weight. IMHO a heavy camera is a steady camera.
Calzone