Firmware Version 1.4.0 incorporates the following enhancement:
重大更新來囉，還記得這部影片嗎？ 那驚人的對焦速度，
https://youtu.be/uuQiqd-a32g
Enhances eye detection Auto Focus (AF) for improved face and eye recognition
at greater distances.
提升遠距離的眼部自動對焦及臉部辨識能力
Improved Auto Focus (AF) performance helps the camera to focus on and track
smaller subjects.
加強自動對焦的效能，讓相機更能追蹤小的物體
Reduces lag time between the actual Auto Focus (AF) and the AF frame display
for images in the viewfinder or on the LCD.
減少透過EVF 自動對焦時的 lag 時間
Fixes a phenomenon in which the AF frame size cannot be changed in the Servo
AF setting.
修正伺服自動對焦時，無法更改自動對焦框大小的問題
Fixes PTP communication vulnerability.
修正圖片傳輸協定的漏洞，應該是資安問題
Mac 下載 http://pdisp01.c-wss.com/gdl/WWUFORedirectTarget.do?id=MDQwMDAwNTA0MTAx&cmp=ARH%E2%9F%AA=ES
Windows 下載 http://pdisp01.c-wss.com/gdl/WWUFORedirectTarget.do?id=MDQwMDAwNTA0MDAx&cmp=ARH%E2%9F%AA=ES
資料來源： Canon Rumors