You wouldn't think a half an inch would be very noticeable but it is. And, yes, the 5-1/2" ones are pretty darn good in their own right. LOL, that one was shortened just before the 5-1/2" ones were released.
That's exactly how I feel about the different feel between a 61 Navy and 60 Army. Taking into account the difference in weight between the two, for me its the 1/2" of barrel length. The Navy seems to track on target but the Army feels like I am waiving a wand. Of course there is always a place for any and all 60 Armies that happen my way.