Don’t think I’ve ever seen this thread before. Some lovely cars!
I also miss my E60, albeit it was a mere 520d. Great car and in hindsight I had no good reason to sell it. As time goes on I’m more and more impressed with how well they’ve aged.
I obviously regret selling my M4, but it was no longer fit for purpose as a daily as I started to do more heavy commuting for work. So maybe that’s not true regret.
I do regret selling my first E46 318Ci - nothing particularly special about it except that it had a white leather interior that I only realised was quite rare after I sold.