After several sleepy and disappointing auction seasons in recent years, the market seems to have finally woken up. Following lively, if mixed, sales at Christie’s on Monday and a rousing Sotheby’s marathon on Tuesday—led by a Gustav Klimt…

After several sleepy and disappointing auction seasons in recent years, the market seems to have finally woken up. Following lively, if mixed, sales at Christie’s on Monday and a rousing Sotheby’s marathon on Tuesday—led by a Gustav Klimt…