A few years ago I found this link to some of the club specs that Tiger Woods plays, here it is:

     From GolfWRX - Tiger Woods Club Specs, 2012

The most fascinating part of this chart to me are the lofts of the irons he was playing (and I bet still will play when he comes back).  His 6 iron has a loft of 32.5 degrees.  Hum.  Well I presently view the "standard" 6 iron loft being 30 degrees, and there are lots of OEM clubs that have 6 iron lofts of 27 or even 26 degrees.

Why would Tiger play with these lofts?  Well, I have my theory.  I think it is because they help him to maintain Consistent Distances between his irons.

Let's just round off his 6 iron loft to 32 degrees.  It is known that to keep distances between clubs of about 10 yards, you need to change lofts by about 4 degrees.  So in his case his 7 iron would be 36 degrees, and ... 

If you do the math, his pitching wedge would be 48 degrees, gap wedge 52 degrees, sand wedge 56 degrees, and lob wedge 60 degrees.  Ah!  He can maintain good distance gaps between his irons, AND play with sand wedge and lob wedge lofts will help him hit the type of short shots that he wants.

Now - how about your set?  Say, conservatively, that you want to get more distance with your irons (we all want more distance) and you find a new set of irons that has a 6 iron with a loft of 28 degrees.  Again, maintaining 4 degree loft differences between clubs - now your gap wedge will have a loft 48 degrees.  BUT if you want to still play with that 56 degree sand wedge (which still is pretty much standard) you will have a gap of 8 degrees between your gap (!) wedge and your sand wedge.

The point?  Well, you get to decide what is really important.  At a minimum, know the lofts of your clubs and what the distance gaps can exist between all of your scoring wedges.  Bottom line - making an informed choice about what set makeup helps YOU to score the best and have the most fun!