Well, I cobbled together a test bed.  I took a big servo wheel for a Futaba Servo and made some wood mounts to hold the GP incidence gage Laser pointer.  The pointer doesn't give a very precise dot, but rather a large oval.  All the tick marks were on the same point on the oval.  The transmitter used is a Futaba 10C modular with the 2.4ghz module and the receiver is a Hobby King Orange set on standard speed.  A 4.8V battery was used.  I didn’t do any end point testing as that would require a different setup.

The first photo is the pointer and servo wheel

I used a piece of ply on end held between four 7 AH starter batteries to steady the setup.  The target was 10 ft 6 in from the center of the servo wheels, =/- an inch.  Photos 2 and 3

My first test was with the servos in a horizontal arrangement.  I soon discovered that the gear lash was screwing things up a bit, so I rotated the setup so the sweep of the laser was up and down.  It looked like the gear lash was still entering into things a bit so I took a 5/8" nut and hooked it to the nose of the laser so there was a preload on the gears.

I tested the following servos, a mix of old and new, but only one servo of a type.  All were Futaba servos with the exception of the Tower Pro 995MG which has a Futaba spine on the output.  The Futabas follow.  S133 mini, S148, S3001, S3004, S3151 Digital and a S9254 high speed digital.  Then the 995MG

Some interesting things popped up.  As my setup wasn't rock solid, changing servos usually required I sub trim the servo to get the dot back in the work area.  I found that the servos all reacted to the sub trim differently (which would leave me to believe that they would react in a similar way to stick movement)  I started counting the clicks of sub trim before the servo started to move in a new direction.  The responses varied from each click moved the 9254 to 6 to 8 clicks for the 995MG.  the 133 was 6-7 clicks. 148 was 5 clicks, 3001 was 4,  3004 was 3 and the 3151 was 2.

All servos showed a range of home positions. And in all, that range shifted depending on the direction you were approaching home.  I also found that a slow release of the stick gave more consistent results vs letting the stick snap to center.   It was quite common for the movement to stop then bump ahead a click.

The 995MG though showed some really strange behavior.  The range of center when lifting the weight always seemed to stop at the same point then drift on to about the same end point range the other servos had.  This stop and drift was near 2 degrees of rotation.  The endpoint range in the opposite rotation was more like the other servos but some what wider.  After seeing this test,  my hopes of the sour apples tuning into a pie were dashed. 

I have a few Hitech servos along with some JR and Airtronic servos that are not mounted in planes at this time, so if anyone is interested, I make another wheel and test those also.

The last photo shows the actual tick marks for each servo