GS350---->LS500

Entertaining the idea of trading in my 2018 GS350 for an LS500. I see there's some 2018-2021's available near me for decent price. What options should i be looking for? Are there any big ticket items to worry about on this model or can I trust the normal Lexus build quality to hold up for years to come. How's the ride quality from a base to an f sport? Which years come standard with apple carplay?