5D3 6D 對焦，徵求使用經驗

最近在比較5d3與6d的優劣

看到
kenrockwell的Review，他認為5d3 6d在色彩、高iso根本差異不大，
所以我的Survey就放在對焦點上了，

他認為6D的實用性與性價比遠遠大於5d3，可看以下原文：
『The differences are minor, so if money matters, of course get the 6D for 40% less money. The 6D loses about 5% of some of the 5D Mark III features, most notably a simpler AF system, only two "C" modes, only one memory card and no auto brightness control for the LCD, but adds the same 5% back with GPS and WiFi not in the 5D Mark III. Many people will prefer the 6D for adding GPS with lighter weight.』

另外，針對6D，他認為提供了一個相對簡單使用的自動對焦系統，器材控可能會喜歡需要東調西調的5D3，但他喜歡用起來簡單的6D對焦系統。
『The 6D has a simpler AF system. You may prefer either; gearheads will prefer the 5D Mark III, and I prefer the 6D』

而canon宣傳的-3ev 中心點對焦，dpreview也有一點評論：
『Focus acquisition on the EOS 6D displays all the hallmarks of mature phase detection AF performance. The camera is quick to lock focus and under most conditions does so with a high degree of accuracy. In reviewing hundreds of images shot with the 6D, the vast majority of shots that did lack critical sharpness were due to either subject or camera movement. Photographing active children indoors will be a challenge, but you will come away with keepers - if you keep your subjects largely in the middle of the frame.

The area where the 6D really shines, however, is in acquiring focus consistently in very low-light conditions. Canon has rated the center AF point's sensitivity at -3 EV, one stop lower than any full frame DSLR on the market. And our real world use with the camera bears out this impressive performance.』

也許對習慣中心點對焦再構圖的用家（5d2的長期訓練）會有許多吸引力
比5d2稍貴的價格，換到更強的中心點對焦。

有沒有實際用過一段時間的用家，也可以分享一下，6d的af
真的強這麼多？