Doubts regarding ARM CPU servers

I do not know if this question is in the right spot... I have been using RaspberryPies for the lasts years and I was wondering questions about **ARM CPUs** in general, so I would like to know more about you guys's ARM's **experiences**... So the questions are: 1. I recently have been seeing some cloud providers use ARM based CPUs in their services (as I did notice aws and oracle are using it) so **is there any comercial CPU to use it in servers** (with ARM architecture, of course) **which I can buy and use it in**, lets say, **an HP Proliant DL380 Gen10 or a DELL server?** I have been seeing AmpereComputing and they sell a very good micro but it's apparently tied to some hardware vendors (Foxxcon, Gigabyte, Supermicro...) 2. **Can ARM CPUs use 64bits instructions?** I'm trying to compare them with actuals 64bits 3. **Could I use KVM in these ARM CPUs for**, obviously, **virtualization?** Could I also use LXD and Docker or Containerd ? 4. Is there an ARM CPU that I could compare with, let's say, an Intel(R) Xeon(R) Silver 4110 CPU?