I had a similar situation on an Infiniti a few years ago. I tried to milk the original tires to the end but didn't make it. I wished I had changed them out earlier. It all depends on how much tread you have left.
GONE: 2012 BMW 550 M-Sport
2016 Audi A7 Prestige
2014 Lexus GS350---Wife's car
2015 BMW 1600 GT---2016 BMW S1000R---2012 Ducati Panigale