推荐回答（2个）
1.先说cmos：d610完胜
毕竟从制作工艺上就已经是跨代的差距了，宽容度也是老生常谈，d610不赢都说不过去了，现在哈苏飞思都在用索尼的底，还有啥好争的
但是最重要的是，多出来的那几ev你真的需要吗？实际上N年前我用550d拍的片子，欠曝3、4档的，后期也能做到能看的程度。但是说归说，你让我选，我肯定还是选尼康这块底像素上的差距虽然2020万和2426万乍一看差的不多，但是算下来也有20%了，在电脑上放大缩小时感觉明显。
高感，使用raw格式，6d的高感不占优势，或者说实话，实际使用中我没觉得两者有啥明显差距，当然可能是我太菜用不好，佳能降噪涂抹乍一看倒是挺厉害
2.再说对焦：总的来说打平手把
6d中心点很好用，但也只有中心是十字，但是其他的一字对焦点都不争气，需要它们站出来的时候经常指望不上，拉风箱没完没了，如果用大光圈镜头平移构图，出现跑焦也是难免的。整体还不如我上一台60d，毕竟全十字。
d610对焦不算强，十字覆盖比6D多了一圈但是也算不上多
暗光对焦的对比：6d有-3ev，确实值得一说，然而d610直接给了个对焦辅助灯，我得说这个灯是一个很好的设计，毕竟在取景器我都能看得更清楚了，但是有距离限制也不是万能的
3.屏幕：6D胜
d610屏幕有点头疼，白平衡偏移怎么调看起来都不对
4.握感以及操作：各有优劣
先说机身手柄，d610偏短，我手算偏小的，但小拇指依然悬空很不爽，单机握感d610不如6d，而且手柄厚度不够，握持的时候中指、无名指的指甲会直接接触蒙皮，所以很多二手d610、d600的蒙皮都被戳烂了，在装上更重的镜头后更显得d610手柄偏小
但是！两者都加上电池盒手柄后，d610手感更好，体积也更小，佳能电池盒手柄肯定是机器人设计的，光看样子都知道握着不舒服，尤其是背面
6D加手柄要拆电池，d610不用
再说所按键设计，iso键，放大键这种常用按键，6D优于d610，6d可以单手控制iso，d610必须双手，很头痛，d610的方向键突出比较多，有点难按
尼康的开关设计胜，单手开机+整合背光控制
最后菜单设置，单纯菜单设计上，佳能好用也好看，尼康菜单分类真是...太不友好了，新手上手慢，按照大家一般的使用频率，彻底熟悉这个菜单估计得花...一辈子
但是尼康左肩的双层波轮设计从菜单中解放了很多功能（比如连拍，静音快门，反光板预升）操作方便很多
D610在live模式下没有曝光模拟，不管怎么调都是一个亮度，然后右下角给你放一个曝光表...尴尬，这个只有更高端的机型才有，佳能貌似全系标配？
6D的评价不如d610好，所以还是优先考虑D610吧
佳能对高光控制好，宽容度低，颜色讨喜适合拍妹子
尼康对暗部控制好，宽容度高，锐度高适合拍风光
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