The first of this year I purchased the newer CZ 21 for the sole reason of comparing it to my Excalibur. I had hunted with the older model CZ 20 for about 10 years so I was familiar with the CZ's and still own a CZ 6a.
So for those interested, this is my opinion of the two machines in an equal comparison. I own both machines and will keep both machines.
Hunting comfort right out of the box......CZ 21
Factory shaft quality....CZ 21
Headphone sound quality.......CZ 21
Coil size and ground coverage (with the CZ in autotune(all metal)) ....CZ 21
Ease of control settings for hunting.....Excal
Weight and comfort of control housing...Excal
Abilty to relocate the control housing for personal choice...Excal
Target type ID by tone....Excal
Targets sizing and shape by tone....Excal
ID of bottle caps....Excal
Iron elimination.....Excal
Abilty to manually tune or de-tune....CZ 21
Depth......Equal, one is not deeper than the other.
Reliability and build quality.....CZ 21
Over all hunting comfort and tones....Excal
Battery recharging...Excal
Price......CZ 21
Customer Service, repair costs, availability of replacement items....CZ 21
Overall opinion, I like the tones better with the Excal, but if I was a dig it all hunter, then the CZ would be fine. If I was a new hunter wanting a quality VLF machine, would I spend the extra $500. for an Excalibur?....no.
The Excal is the Cadillac of the two machines when it is working right, however the CZ 21 is going to do the same job at a lesser price and will probably last longer. Just this users opinion, others may vary.
For those interested, this was a backyard air test of the two subject machines, both setup the same way. http://www.youtube.com/watch?v=kc0Ac8hUwTk