Ok so here is the problem.
A friend wants to buy a brand new canon 6D. But then he saw some preowned 5D mark III for just a little bit more.
How many of you would feel guilty of buying a 6D when you could get a 5D mark III for the same price or vice versa.. and by this I am not talking about any technical specs or what he wants.. more like higher model perception or value of money ...
Also note that he just has a 50mm f1.4 atm. But wants to buy the 24-105f4 as general purpose.. if he buys the 6D, he can get that lens now. If he settles for 5D then he will have to wait for the 24-105 but eventually he will get it.
How can you ask whether someone would feel guilty? You cannot assign guilt to anyone other than yourself - and maybe your dog when the sofa has been eaten while you were away. Even then, possibly it's you who should have taken better care of your dog. And what we would do is also none of your business. You ask a very insulting question IMO.
You have no idea of your "friend's" intentions or motivations. IMO you're simply posting here to find some who will agree with your "I am superior" assessment of this individual's perceived stupidity and immorality. He's not buying what you think is the "appropriate" gear, so you feel you should criticize what he is buying?! It's said too often on forums but I think it applies here, grow up. And shut up, certainly to your friend and about your friend.
I agree with Tim when he says a beginner probably shouldn't make the most complicated product their first piece of gear. However, having sold high end electronics for several decades, this happens all the time. My job as a sales person was not to question the purchase, only to facilitate satisfaction in ownership. Many clients entered the store having already made up their mind they would own "X" simply because they perceived "X" brand or "Y" model as above others in quality and name recognition. They had their reasons and, if their money was not acquired by immoral or illegal means, no one has any business commenting on what others choose to own. Would you criticize him if he was on this fourth trophy wife? That too is none of your business. Friends stick by their friends. Otherwise, you are not being much of a friend. Think what you care to, but keep your mouth shut and don't run to forums to report on what your friend is up to. Even anonymously.
Your friend may take pride in having high end gear just as he may take pride in having nice clothes or taking high end vacations. Maybe none of that. Maybe he's just another jerk with money. If so, question your reason for being his friend but do not question his actions with his money. None of this is your business. It is, IMO, a bit of a shame when people buy just to have and their attention span can't bring them to settle on any one thing and learn how to enjoy the hobby for its benefits rather than simply for owning stuff. That, however, is a comment on society as a whole, not on a single friend. If your friend never progresses beyond taking Sunday morning snaps of his cat, then he's wasted a lot of technology. But it is his money to spend on what gives him pleasure.
Period.
Is he borrowing money from you to make this purchase? No? Then shut up.
Is he somehow taking money from you that would have otherwise gone to your keeping a roof over your head? Food in your stomach? No? Then shut up.
Did he kick an old lady and steal her purse on the way into the store? No? Then shut up and stay shut up.
It really isn't your place to criticize your supposed friend. I've been on too many forums where someone is criticized (by some a-hole who equates what they own with their value as a human being) simply because they don't own what someone else feels is an adequate component. Of the two, I'm not sure which is the more egregious flaw but I certainly know which is the most out of place.
Encourage this friend to become a better photographer and enjoy his company as a friend. If he's a good friend, realize no one has enough good friends to go around.
I fully understand it's difficult to watch someone throw money at what seems to be an illogical choice but, it's not your choice to make or your place to comment. If this friend truly is a friend, it's your business to remain his friend. You don't do that by running to tell others what your friend is doing. IMO you're not much of a friend if you head to a forum to get an opinion on what this fellow is up to. Look at your own behavior and motivations, not those of your friend.