I doubt you'd notice a difference. Over a long distance it should be faster then fiber (hence the private networks set up by HFTs). Had an office in Boston with a microwave link; it normally worked great, but could be disrupted by extreme weather (like heavy snow).

Currently, including some video conferencing on my laptop and a few others using the link too, I'm seeing 5-7ms ping times. It varies, but I think its fair to call it 'more than adequate'.