I've had a lovingly converted Grey Knight Grand Master for several years now, and I'd finally decided to fill out my Grey Knight army and bought a bunch of metal termies and GK marines and a forgeworld dreadnaught on ebay about... a week before we started to get solid confirmation on a new GK codex. I was so frustrated ny the perversity of it that they then sat unattended for a few months as I kicked myself for not waiting, then I finished them all at a furious pace to get them done before the new codex and models (out of sheer bloody-mindedness). Now ever since it did come out they have sat on a very nice little shelf while I try to figure out what to make of them...
What this boils down to is a simple question (and I apologize if it's been asked), but proportionally how do the old metal Grey Knights compare to the new ones (especially the Terminators)? Are they the same size, or are they noticeably smaller like old vanilla space marine termies look next to new vanilla space marine termies? I've tried to judge based on pictures, but I haven't had the chance to see them side-by-side, and I'm loath to spend the money on some of the new models (beautiful as they are) because I know if they don't fit with each other then I won't be satisfied until I have replaced my entire little army with new models, a project I'm not eager to undertake for many reasons (not the least of which is financial). So I look to you my fellow long time Grey Knight owners to provide me with answers.