No, not grasping at straws, just simply considering all of the lenses that are available for a camera. If you want to limit yourself to only those lenses that the camera vendor makes, fine, but don't impose those restrictions on others.
There are many fine lenses that are made for use on Canon/Nikon that are not made by Canon/Nikon.
The grasping at straws part was more about the fact that considering the Sigma 35/1.4 gets you barely a marginal improvement, as I said - throwing away 13 MP instead of 14 MP.
If I was going to have a grudge, it would be because of something it them taking 4 tries to Canon's lens repair service to fix the IS in a 70-300 IS USM (non-L).
"Yeah we fixed it", "No you haven't, try again." "Fixed it this time.", "Put on a camera and it didn't work, try again." la la la
And with Nikon, that might be <wait 4 weeks> "Yeah we fixed it", "No you haven't, try again."<wait 4 weeks> "Fixed it this time.", "Put on a camera and it didn't work, try again."<wait 4 weeks> la la la
No, the point of me saying this is because lots of people are arguing that "Canon cameras sell well, so obviously 18MP is enough" or "... so obviously the DR isn't important." In a sense they're right, but it appears that it isn't the IQ that is selling the camera - it is the bells and whistles.
In a sense? No need for a qualifier there. As I've stated before, people buy cameras not sensors. Their reasons for choosing one camera over another are as varied as the people themselves. Canon recognizes that people buy cameras, not naked sensors, and they design their cameras accordingly. The fact that they continue to outsell Nikon across the lineup quite clearly indicates that they know what they're doing in terms of camera design (including the sensor).
Saying 'it isn't the IQ that is selling the camera' is an unrealistic over-generalization. The problem is that some people seem to suggest that simply because the sensor in a Nikon camera offers a couple of extra stops of DR, that means the IQ of the sensor in a Canon camera is unacceptably poor. It's that sort of attitude that raises hackles around here, and for good reason - it's complete crap. If you want to peddle that line of BS, try a Nikon forum...I'm sure you'd be welcomed with open arms.