Thanks for the heads-up... The 59 reissue felt pretty good, nice round neck, but not as meaty as the SL1. I only played the 59 for about two minutes though.
I'm not a "shredder", so the fat neck may suit my playing style without being a hindrance. I need to spend some time playing some different neck sizes and profiles. Hopefully it will help with fret hand issues too. The long lanky fingers and thin necks just isn't working out too well... though I have been trying to change the way I hold the guitar and my wrist angle, etc.. Maybe I can figure out how to play in a way that won't get too tiring on thin necks.
For lead guitar up the neck, a thin neck like a Wizard prolongs playing time without fatigue.
But on first position chords, a fatter neck makes it easier to play cowboy chords. Finger and hand size isn't the main issue but where you play the guitar the most.
Also wearing the guitar high enough can also reduce fatigue. While playing super low looks cool, it can be hard on the wrists.
Someone should make an all around neck with fat neck on first few frets with curvy radius and flatter radius and more slender neck on high frets.
I don't know if anybody makes a neck like this. There are necks which are rounder radius on first few frets and flatter radius down the line but those necks are usually pretty consistent in thickness from first fret to neck joint. It may look weird to see a neck with so much mass on first few frets and have it be slender around 10th fret onwards, but that could probably make for a neck that is comfortable both in first position and on higher frets.
You have to see where you are putting the most time on the neck. If you play at least some lead guitar like a lot of us a good place to start is see where neck is at 12th fret or so.
Less than an inch is typical and while Gibson didn't have hard and fast rules, here's some details on fat '58, medium '59, and thin '60 necks as well as some profiles of common Fenders. Many other makers, Ibanez included, are derivative of these basic shapes. Very few players are going to call a typical '58 neck "thin" and very few are going to find a slim taper 1960 neck to be too fat.
To transfer to something very common like the midline 2015 Ibanez AS93, the current neck stats are very close in specs to original 1959 Gibson necks but a shade thinner. A 1958 neck is closer in higher frets to my 2006 Artcore, and RG and S necks fall closer to the 1960 Gibson neck being a tad thinner. Things like finish on back of neck can affect overall feel and a heavy, shiny poly or shiny nitro finish will make a thin neck feel slightly thicker and slower, and make a medium neck sometimes feel somewhat fat.