I've logged over 140 flights aboard 747s on twenty different airlines, most of them in First Class and often while sat in 1A for the same reasons that you're excited about doing so. Pay no heed to anyone yammering on about the seat not being spacious - at least in a universal sense. It obviously depends upon the airline and its individual cabin. I can tell you on good authority that the windows clearly have a more forward angle and the fact is that you can indeed get a bit more forward view than you'll get sitting back in 4A. The operative words here are "a bit". You will not get an unobstructed forward view.

Here are some pictures from a flight I did aboard British Airways while sat in 1A.