Is there an anti-virus that would have the absolute highest detection ability?

If you just want the numbers then AVIRA AntiVir PE Premium has has the highest detection rate (81%) of unknown viruses, these are not yet added to the virus signature updates you regularly get. Even though it has the highest detection rate it also has many false positives.

AEC TrustPort AV WS has the highest detection rate for known viruses (99.8%).

NOD32 is still the best though overall with a detection rate of unknown viruses at 71% and a detection rate of known viruses at 97.7%.

NOD32 won AV Product of the Year for the last two years and Kaspersky won the two years before that.

Is there an anti-virus that would have the absolute highest detection ability?internet security software

NO anti-virus can ever be relied upon to give 100% absolute protection. None of them do, free or paid. Most only detect about 85 to 95% of all KNOWN viruses. When a brand new virus is released, NO signature-based anti-virus will detect it for several hours up to several days. And over 1200 new variants of viruses and other malware are created by the "black-hats" each and every day.

You should consider an anti-virus program to be your "last line of defense". Safe internet surfing and downloading practices (i.e. NO P2P) along with maintaining your Windows and all your installed software with all critical updates and security patches should be your frontline defense.