Clearly, the quality of these two gifs are not equal but just looking at them you get the reason why you so desperately need to see this unaired pilot.
It is shorter, there are less cameos (Mycroft doesn't get his fabulously dramatic entrance) and it's thirty minutes shorter but what it lacks in pure quality and polished charm is the raw, unfinished nature of it.
It is so apparent that all of them (Moffat, Benedict, Martin, Rupert) have not finished making all of the great and small decisions about their characters, about the relationship and about the structure as a whole.
Both Sherlock and John are younger in the unaired pilot, Sherlock is practically a teenager while John is less an aged, world-weary soldier and more defianlty homosexual Three Continents Watson.
Some of the delivery is sloppy, Sherlock moves likes he's just recently learned but he's open in a way that actual canon denies possible.
John is dressed in stylish coats and open collar dress shirts. The limp is incredibly disgusting and fake but he's also eye-fucking Sherlock over the firelight and shooting the cabbie.
Every time I really get into a fandom, I try and watch the unaired pilot. First of all, to see who that one actor/actress is that gets replaced (in this case, Sally Donovan is some other black English woman with less power and weaker line delivery. They really dodged a bullet there)
It's so apparent in some cases how much deliberation and minute action goes into a character. The littlest things like the cut of a coat can tell you so much about a person and their motivations. Watching the pilot was like getting a glimpse at Johnlock (ship name) in utero.
If this last gif does not convince you then you're dead inside.
That is all.
For everyone who has not seen the wonderfulness that is the unaired pilot, please go to
http://www.dailymotion.com/video/xtsdwg_ssherlock-2010-unaired-pilot_shortfilms