Question: What is the motor yacht with the highest gross tonnage whose instance of is motor yacht ?
Paraphrase: What yacht motor is the heaviest?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q21505397 . ?ent wdt:P1093 ?obj . ?ent wdt:P31 wd:Q21505397 } ORDER BY DESC(?obj)LIMIT 5 
Answer: Al Said, Eclipse, Azzam, Topaz, Dubai