I am going through a similar dilemma however also including the tikka t3, I went to the shop yesterday and shouldered all of them for about 20 minutes. Ill share my thoughts.
The sako by far had the best, smoothest action.
The xbolts stock is the same material, but is thinner and feels cheaper than the sako
The tikka stock was a different cheaper material than both of them and was by far the worst.
The mag on the A7 really wasnt that bad, i heard a lot of people say it sucked but it was strong, and fit was perfect!
The browning and the sako both came up to the shoulder well, this is more personal, but for me I think the a7 wins this race too, not by much, it just seemed to fit better, put my face in perfect position.
overall, I decided on the A7 and will be buying one in a week or two.