Magico A3 vs Magico S1 MK2

I am very happy with my A3s. They are full range as compared to the S1 mk2. To me the real question is what is the increment difference between the A3 and the S3? However, the A3 was more within my financial abilities and it is an end game speaker on one of my two systems. It is also a bit versatile. I have driven them effectively with First Watt M2 and SIT-3 amps. But also with Benchmark AHB2 monoblocks and a PrimaLuna Dialogue Premium HP. Of course, good cabling and interconnects will be used effectively with the A3s Bottomline: If the choice is between the A3 and the S1 mk2. The clear choice for me is the A3. Good luck. 

one upside to the S1 is that it comes in colors other than black. Makes it easier to integrate to home decor than the A3 that only comes in black. 
A3 also sounds thin to me compared to the S1. 

@kingbarbuda I heard the A3 with my stereo Benchmark AHB2 and it was not that great, the sound seemed collapsed into the speakers. Have you compared the AHB2 in stereo mode vs AHB2 mono blocks with the A3? I had a suspicion that the single AHB2 amp was under-powering the A3's.

I was in this same position last summer. I was offered a demo pair of S1MKII in m-coat around the same price as the A3. The A3 sound  great but imo the S1MKII are on another level. The mids and treble are clearer with more definition than on the A3. It is more true to life and presents more of what it is given. The S1MKII also disappear alot more than the A3. There is less bass but what it is lacking can be made up for with a pair of subs.
The S1MKII is also more expensive at list price. M coat comes in at almost 10k more than the A3. I would also take a look at the new A1 with subs those speakers are pretty damn good. If you can get a pair of the s series though I would do that over the A series. They are just a more refined sound presentation.