There are a number of synonyms for the phrase "challenge comparison". For example, one might use terms such as "stand out", "excel", "outperform", or "surpass" to describe a situation where one entity or individual has managed to distinguish themselves in comparison to others. Additionally, one might use terms such as "competition", "rivalry", or "comparison" itself to describe the overall context in which such distinctions are being made. Finally, one might also use terms such as "benchmark", "yardstick", or "measure" to describe the specific criteria being used to determine which entity or individual is performing at the highest level.