【Luxurious】 , 【sumptuous】 , 【opulent】 are comparable when they are applied to things and mean ostentatiously or obviously rich and magnificent.
Something 【luxurious】 (see also SENSUOUS ) is exceedingly choice and costly.
Something 【sumptuous】 is extravagantly rich, splendid, gorgeous, or 【luxurious】 ; the word usually suggests a grandeur or magnificence that almost overwhelms the senses.
Something 【opulent】 (see also RICH ) flaunts or seems to flaunt its luxuriousness, or luxuriance, and, in some cases costliness.