. . . and if the day-to-day variations in different positions reflect minimal change, then your sample is very well adjusted indeed. I've experienced similar levels of accuracy with two of my G Os, and all of them have exhibited a high degree of rate stability. Additionally, a perpetual calendar complication exerts considerable drag over the power supply, so there is even more to appreciate. One tidbit of information: the cal 39 and cal 100 perpetual calendar movements are adjusted in five positions with a maximum variance of +10 and -5 seconds per day. All four of my cal 39 perpetuals, either out of the box or returned from service, have met this tolerance range, and for extended periods of time.
As for comparison with their neighboring manufacturer, there will always be those who judge any perceived difference in finish quality as worthy of expenditure. They are welcome to part with their money. I, for one, would be incredibly delighted to own this . . .
. . . and happy to pocket the change ;-) . . . cordially, Art