Yes, 90% of PIX and ASA commands are identical. The rest of 10% are commands available in ASA only. The main difference in my opinion is ASA the ability to support WebVPN sessions. ASA is also modular, you can use for example a real (hardware) IDS module.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...