PHOENIX — The A5 is an attractive version of Audi’s A4 sedan and is available as a coupe, four-door Sportback, and a Cabriolet, tested here. The A5 Cabriolet is available in a choice of two trim levels: base ($49,600) and the performance-oriented S5 version ($62,300). Both trim levels are luxury drop tops with an attractive exterior and a formal interior. Both are well tailored with superb build quality, top rate materials — leathers, wood veneers and brushed aluminum or stainless steel trim — comprehensively engineered with impeccable attention to detail.