Hi. I was measured at 9.5D (US size) on Iron Rangers and wear Wolverine 1000 mile wingtips the same size which are just a touch large both length and width. sneakers I wear 28cm New Balance.
Would that mean I should get a size 9 (AUS/UK) = size 10 US? Just wanted to make sure I didn't mix up US size with UK/AUS size. tks!!
I don't want to be making any recommendations and then feeling guilty if you end up with the wrong size. That being said, I wear a 9.5 D in Iron Rangers, which feel just a tad large, but I thin the 9 D would be too short. I am probably more of a C width in work boots. The Wolverine 1K boots in 9.5 D fit me a little larger than the Iron Rangers, but the Wolverine 1K boots in 9D were a tad short--and boy do I hate boots a tad short....My RM Williams Comfort Craftsman boots are 9.5 G in AUS/UK, which translates roughly to 10.5 D in the US.
I now think I would probably be happiest with a 9 G or 9 F (a little narrower). I bought the larger size because I based it off of my athletic shoe size, rather than my American-made quality shoe size, such as Allen Edmonds or Alden. On a Brannock, as read by a salesman in a reputable local store, I am a very solid 10, with a width between C and D. He measured my arch at a 10.5.
I can add that even though the 9.5 G is a bit large for me, it's still comfortable--probably because of my slightly long ball-to-arch relative to my total foot length.
With regard to whether one should get the "Comfort" version or not, I am happy that I went for the comfort. I have many leather-soled shoes and like them a lot, but they are less practical in snow or rain, or with salted roads. The comfort version does not look like a rubber-soled boot...it looks like a leather sole, except from the bottom. The Poron insole absorbs an amazing amount of the shock of walking on concrete, while being remarkable thin, so it doesn't affect the stability of the foot, as too much squish can.
I have no connection to bootsonline.com.au, other than buying a pair of boots from them, but I can endorse that they are super nice and ship same-day. If you email them, they will gladly discuss sizes with you too. Of course, different RM Williams boot models will fit differently from one another.