I'm not saying it was or wasn't hardened or tempered properly. I was just asking how you knew if it was. If it sharpened easily it's a good bet something wasn't quite right. You can test the hardness with a file. Lightly run a file over it. On the blade section it will have a glassy and smooth feel and sound. Compare this to how it sounds on the tang section that hasn't been hardened. There will be a difference.
If they sound the same you should repeat the hardening process. Bring it back up to temp and quench it again!
1084 or 1095 are good carbon steels for knife making. They work quite well when annealed and if heat treated and tempered properly provide a good finished edge that holds it's edge well and is able to be resharpened by the user.
If you use files make sure you use old Nickolson files that were made in the USA. Don't buy new ones...they are mostly case hardened and are not suitable for knife making. Some of the older saw blades can make a good blade. You don't really know what kind of steel it is but if you follow your heat treating/tempering processes you can end up with a fine blade.
I actually cut a couple of pieces off some saw blades and sent them to my heat treater and he identified what steel they were and if they could be heat treated.