I think the issue was that film absorbed light whilst sensors reflected light.
The film era lenses were potentially prone to ghosting, whilst the digital era lenses had coatings on the rear elements to counteract this. In practise I've only seen one lens with horrific ghosting, the 75-300 USM.
I wouldn't worry about it. If anything the new lenses will get more out of your 1V.
It seems from comments that it's assumed that digital is now ahead of film. I would welcome a comparison between ilford XP2 super with a red filter and a 1DX set to mono or with a red filter.
Ilford XP2 super is fairly grainy, but with a pleasing pattern, and with a red filter, decent contrast for a chromagenic (panchromatic, eff that, I'm not a masochist)
Folk may cry 'off-topic' butthe digital / film comparison has already been drawn..